My Backlink Efforts — Any Tips?

Hello everyone,
Hope you're all doing well.

In an attempt to increase my Domain Authority (DA), I've been trying to look at attainable methods of getting backlinks.

I've heard a lot about how Medium[dot]com can be a good option, and I was considering it until (what I think is) a better idea came to mind.

My niche is chess. The most authoritative chess website is Chess[dot]com, a platform where tens of millions of people play chess online.

This platform allows all members to blog, and it turns out that they allow members to promote their own websites and services within reasonable limits.

Members who show consistency in writing helpful, well-structured content can apply for Top Blogger status, which drastically increases the visibility and reach of their blog posts.

I recently learned that things like my Pinterest posts and Quora bio don't classify as backlinks as these aren't editorially placed — they're just profile details. Therefore, I believe this is a golden opportunity, as it allows me to editorially place links to my site with very relevant anchor texts.

I'm hopeful that this can boost my DA so that Google can start taking my website seriously.

Not only that, but when I hopefully become a Top Blogger and my blog posts start appearing to a lot of members, I can raise my brand awareness and gain regular visitors to my site.

That's all fine and dandy, but there is something which has been troubling me a little.

The Potential Problem

I just published my second blog on Chess[dot]com today.

The way I go about it is that I pick a topic I already have an article about on my website, and I write something very similar but with some missing details or elaboration.

I then link to my website article and urge the reader to go learn something key or see more practical examples because they would already have the "reading momentum" if you will.

Here's the problem:

This method naturally means much of the content will be duplicate.

Will this affect my website?

I'm hoping that it won't for three reasons:

1. The article was published on my website first.
   
2. Since I'm linking to my website on many occasions in the blog post, this implies that the main content can be found in the website I'm linking to.
   
3. I'm the same person. But do Google know that? I think they should.
   

Is this wishful thinking?

Now, what if this has no impact on my website, but on the Chess[dot]com blog posts themselves?

Will Google treat them as duplicate and not index them? In that case, my backlink efforts will have gone to waste.

In all honesty, it's not practical for me to write brand new blogs on Chess[dot]com as I don't want to double my blogging work.

I want this system to work. Will it?

I would appreciate any insights and advice any of you may have.

As always, thanks for the help.
Yusuf