Follow these steps to build backlinks from medium:
1) Create a free account or upgrade if you desire to at medium.com
2) Setup your profile
3) Attempt to create a new post but instead, use the import option to import your existing article on your website to Medium. Yeah, medium allows that and even help you add a special url structure that tells search engines like Google that your website own the actual content not Medium so they rank you higher than theirs.
4) Delete some part of the article and add read more link back to your original article page on your own blog/website.
That is it.
Within one to two weeks you will see medium reflecting as part of the sources of your backlinks in your Google console or other backlinking tools like SEMRush, Ubbersuggest etc.
Also, read How to get free backlinks from Youtube
Need More Free Backlinks?
Then check the full list of websites/blogs this forum got backlinks from and how you can replicate same for free - List of Websites For Free Backlinks
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