I'm on Mastodon and Bluesky but rarely visit -- not sure I need that kind of network after all. I don't feel any loss of value after closing my Twitter/X account, and am glad to have the time back.
I've basically narrowed my use down to two networks that I visit regularly:
IG (private account) for photos of friends/family and some interesting strangers. I keep my follow list quite short, and unfollow liberally if I feel I'm not getting anything out of the content anymore. But lately the sponsored and ad content feels like 5-to-1 vs my actual follow content. If my family didn't use it to see pics of my kids then I'd close it.
HN: the only reason HN works is that it's not centered around "following" people (like every other network), which then becomes a race to get more "followers" which becomes some sort of currency. I saw this happening with Quora in its early days where after a promising start and really interesting content/replies by actual experts, it turned into a little attention-seeking groupie club--that's when I closed my account.