How do you all keep track of these? How do you manage them so they don't waste your attention?
I felt the need to protect myself from these sources of FOMO.
When it is necessary to set up a group chat, I like them short-lived. You organize an event with friends. The event is over. I delete the chat for all. Sometimes I lack the ability to do so. So I just leave, usually leaving a see-you-soon note. You know, ruthlessly prioritizing where I am spending my attention, while not acting like a d*ck.
I keep less than a handful of evergreen group chats with family and close friends. All of them with notifications on mute. No read, played, delivered ticks as well. If I need confirmation I'll just call them on the phone!
I leave notifications on for a few folks like my dad. He can get my attention anytime, anywhere. A good old phone call will definitely catch my attention too.
In return, I get to spend real good quality time, when they are not around, with my partner, family, close friends, and acquaintances. And hopefully they do too. :)