Will links from Author Bio from High DA sites add value?

Hi,
Yesterday i read a blog where the webmaster increased the DR by 10 and traffic by 30%. within 15days just by guest blogging on 9 High DA sites.
As my website is an e-commerce store. My options are limited because most of the high DA websites charge money for the sponsered post.
Because i am planning to build high DA links without buying but by publishing high-quality guest posts.
So i am planning to write articles on business, entrepreneurship which is somewhat relevant to my niche and then ask them for a link from the author bio.
My question is : Does author bio links from High DA websites add any SEO value compared to contextual links?

Can't believe that simply works. Makes no sense, unless he does overwhelming articles, or he is a master smoke seller... In 20 years of Internet experience, I've never visited an author bio in a separate page, unless the author bio is part of a snippet within the footer of article.

For example, copywriters drive a lot of attention, and if you guest post a good copywriting article and the link to your copywriting site in your footer bio, then, there might be a possibility of driving traffic. Maybe in other areas like self-development and things were people thrive to sucess and are dazzled with any shit, this may work. But if your text is about how amazing are some type of excavators, trust me that you are going to drive 0% traffic from your guest posts, even through a footer link bio.

I am not worried about traffic because the traffic will not be targeted traffic. My niche is a micro niche in e-commerce and i am posting in broad general niche such as business and entrepreneur and startup. The link will be in the footer of the article in the author bio section.

All i want is SEO value and more authority to my site.

To answer your question simply; yes this will add SEO value to your site.

Only if the website linking back to you already has a good backlink basis and a strong authority.

However I can’t promise that this site will provide you incredible results, but it will add SEO value that you are looking for.

Sure your it will helpful for SEO and the link juice pass to your website also. So that you can get possible chances to increase the authority.

This type of links are counted as backlink to your website. You can start the process and get improvement soon.

It will help boost your authority for sure. The best thing when you get an author bio or byline with those sites. You can just keep on posting content that are relevant to your niche and you can control the articles.