Google parasited (not a word but should be) your niche sites, now post HCU it's time to parasite back.
If Reddit is getting your traffic, start ranking on Reddit. Linkedin showing up in your B2B play? Great go leverage it. And if you're sneaky enough, you can send high quality backlinks back to your site whilst you're at it.
Charles Floate recently launched Parasite SEO and I've been playing with it - you type in a keyword and its AI shows how competitive the SERPs are for a parasite play, and how many free and paid opportunities there are along with the webmaster contact details. I forgot I used to do this manually over 10 years ago when was getting links for SEO clients and trying to rank medium publications. Finally there's a better solution.