I follow 400 people on Twitter and only see the same 10 accounts non-stop. Nobody else. Where is everyone else I follow? Honestly, I think they're mostly shadowbanned or de-ranked. Who knows why.
Have you checked if they’re still tweeting? I still have a twitter account, to hold the username on the off chance that Musk gets bored and divests to spend more time with his car tunnels. At least among my social circle this is rather common; if I look at the ‘following’ tab on that account it’s rather quiet.