So I sent mine to a bridge page, an selection of offers which then links. But you don't have to do this I just did to provide more offers. You can link direct on medium idk I've never had problem but I also don't 100% of articles make just to rank. Medium is such strong domain you can abuse the system pretty good just spam links on what you want to rank for. I find it's still best to use some variety. I usually do a CTA in first paragraph. Then floating link in middle (non contextual) and another at end. Then I also link to my other articles so people will read those. Make sure to save them to lists those are internal links too.
Um just go on marketplace for $1pbn and smmtribe I would Ctrl+f "backlink" and you'll see some options the mix ones I think work best but sometimes I just do the exploit ones. Idk.