Questions needing clarification and advice after the Google algorithm update

Hello everyone,
My website has been around for a while, but I haven’t focused on SEO until recently. At the end of December 2024, I redesigned the website and optimized it for SEO. However, I haven’t done anything with the blog section yet—I’ve only updated the products and added detailed product descriptions. Before the Google algorithm update, my kitchen cabinet category was ranking in the top 5 in the Vietnamese market. But after the update, its ranking has been steadily dropping. Can you tell me what the issue might be? If I add more blog posts related to kitchen cabinets, will that help improve its ranking? Please advise me.
Here’s the link to my kitchen cabinet category: https://mykhang.com/tu-bep/

Any redesign or site shake up can trigger a reevaluation by google.

I'd leave it awhile to see if your rank returns naturally.

If not, you have changed something that was helping that pages optimisation. Look at backup or cache to compare then to now.

As for blog posts... Yes, more focused content will always help a site.

PS: It's not wise to openly share personal site URLs around here. Remove it.

Making big changes on the page may require rechecking.

Have your page opening speeds tested on both PC and mobile and optimize if they are low. After solving the speed problem;
Do internal linking for each blog post.
Implement backlinks for the main domain and subject headings
To be successful in local, make local backlinks in the relevant country.

In addition, update your articles every few months

I experienced a similar drop in ranking with the previous Google update. After that, we followed SEO best practice (high-quality content, on-page optimization). Now I recovered the steady decline of search traffic, everything's running smoothly. Anyway, you should start acquiring backlinks slowly and try to update your content.

First of all, don't make your sites, niches, and keywords public on SEO forums.

As 30 minutes have already passed since you've made this post and you can't edit it anymore I recommend that you click on the "report" button beneath your post and ask a moderator to delete the website from your post. It's much safer

Secondly, I am not going to comment on how your website looks because - if this is meant to be an ecommerce website - it's an atypically looking one and I wouldn't know what to say in detail since I've never dealt with such a site before. The site looks good, no doubt about it. But it looks more like a blog than an ecom site, so I'm not sure that google likes it, because they might not know what to do with it (rank it as a blog, or as a ecom site)... Probably this is why (among other things) you started losing rankings.

Some things you can do to try and get it back on track, but I'm not sure that they'll work, but it's stuff that you can try...

1) the 3rd and 6th links on your homepage don't work. If you want to rank in google you need error-free sites, so fix those 2 links

2) speaking of links, there are no internal links between your pages, and internal linking is important nowadays. So, make some links between all of the pages in each category (link the pages in Kitchen Cabinets among themselves, link the ones in Bedroom category among themselves, etc)

3) yes, adding more content can help. But I'm not sure that this is the main problem. Like I said, your site looks very atypical, which personally I am fine with. But google might not be fine with this as they like to see the same things for all sites of certain types.

4) if you wish your site to be considered ecommerce, and you want google to also consider it ecommerce and rank it for buyer keywords (kitchen cabinets for example) you might want to add pages like Shipping, Privacy Policy, Terms and Conditions, Refunds, Contact, etc... all of the standard legal and ecommerce-related pages that you see on typical ecommerce sites.

Just load up 5-6 ecommerce sites into your browser and see what type of pages they have (and what they write on those pages) and mimic those pages and their content, but edit it to suit your business. At the very minimum, I think that the Privacy Policy and ToS (Terms of Service) pages should exist on your site regardless, otherwise google might not consider you a real business and they might not rank you at all as they take this legal crap seriously...

5) if you wish to keep your site as a business-looking sites, you can separate the various sections (business, store, blog) into their own folders / categories, like...

site.com (this will be the business looking site, including pages like About Us, Contact, Services, Portfolio, Gallery, Our Partners, etc)
site.com/store (in here you will put all of your products, such as kitchen cabinets, bedroom cabinets, etc.... in their own categories, of course)
site.com/blog (this you will put all of your content that you write and from which you can link to your main site, or to your store, as needed)

6) your site has too little authority (DR) and too few backlinks and RDs (Reffering Domains, or linking sites, it's the same thing), so you might want to get more links and point them to the important pages of your site: homepage, store page, blog page, main category pages, etc...

EDIT: aside from these tips, like other people said: it's also possible that you've lost rankings due to redesign / changes you've made to your site in general (you changed the theme, the structure of your URLs / pages, etc). Google does penalize sites (algorythmically, not manually) for such changes, so it's definitely possible that this had affected your rankings too. I would still add those pages and the internal links, though...

After the March 2024–2025 core updates, Google has tightened EEAT and content depth signals. Sites with only product/category pages often lose ground—Sistrix tracked an average 18–25% visibility drop for thin ecommerce categories. Adding blog posts can help, but only if they interlink properly to your cabinet category and target queries with informational + commercial intent (e.g. “kitchen cabinet trends 2025” → linking back to the category). Also check Core Web Vitals in GSC (LCP <2.5s, CLS <0.1) and whether competitors now have richer content hubs. The issue isn’t just “missing blog,” it’s topical authority plus site health.