The Instagram app surfaces Threads posts and automatically redirects you to the Threads app if you click. Threads web visitors is very low compared to rivals, it's mostly this Instagram clickbait tactic driving the numbers for the mobile app.
I can't remember having seen any engagement on twitter/X in years. And that's with thousands of alleged "followers"
I used to participate in some subreddits where support is offered for a couple of chronic illnesses I have but even those are "doctor says it's X, am I cooked".
Just over it.