How to rank up single post?

Hello,
I am a bit lost and I would need some information. So what I need to do is to rank up my single blog post on big keyword.
What should I do to rank up higher? My blog post is unique, good information, written by myself.
Do I need to buy links? I don't really know any techniques to improve my post's ranking.
Any information would be appreciated!
I submited my post URL to Bing Webmaster and Google Webmasters tool and I followed every guideline of SEO plugin. (Titles, metas, keyword mentioning in post, no misleading information and it is really revelant to the keyword)
My website's setup: Clean theme with normal page speed, site's on wordpress, .com domain
Also, sitemap submited to webmaster tools, no errors. I think everything is in good order, so what I should do next to rank better on that keyword?

If you're using social media to promote your site (like you should be) then sharing your content and getting it shared by others is your main goal right now. Of course your page has to be optimized properly and feature outstanding content to rank at the top among others, but sharing it and getting it talked about just confirms with Google that this is the page people want to see.

Light social bookmarking is good if you have active profiles and don't spam. But remember, build a following on at least one platform, whether its Pinterest, Twitter, G+, etc.

Any good reads on how to build a following / promote your social media pages without paid advertising? Well I created a board on Pinterest and shared my post on twitter, but I have no followers or anything. Would simple tags for my keyword help?

i too am always looking for tips, but in the years i have been playing with the net! there is no short cut to hard work..

You can do web 2.0 posts yourself using WordAI. PBN links you can buy from marketplace. Use generic and brand anchors for web 2.0 and money/LSI terms for PBN links.

The overall theme of the site weighs on the post. A single post about payday loans in a site about flowers won't cut it. Make sure to work on LSI.

Buy links to the post from marketplace, get fb likes, retweets, fb shares, g+.

I would use the external anchor-texts to focus on a single keyword with the external links pointing at that particular page .

Do some link building like web 2.0 and social media its surely help you.

Well, I thought about this before starting a site. And I think my content is not all over the place, site's theme is like a home decour things, cool items to decatorate your home with and my post is about a popular item and I have about 6 other blog posts in the same direction. What LSI stands for exactly?

blog commenting and forum posting according to niche are best way now a days