xitter for mastodon
This was step 1 for me, and it happened at the first rumbling of Musk taking over, though I don't use Mastodon.
traded reddit for lemmy/kbin
This was step 2. I was using reddit and lemmy side by side, though mostly ignoring reddit, until the API change came through. I deleted my reddit account then and haven't looked back.
discord for matrix
I did this a few months ago.
youtube for peertube
I don't really use either...