I got a mastodon account on the mastodon.social instance years ago and took another look recently. I still can't figure it out. I see people say they're movin

I got a mastodon account on the mastodon.social instance years ago and took another look recently. I still can't figure it out. I see people say they're moving to mastodon, try to search for them on the platform, and find nothing. Possibly they're on another instance that's not searchable from mastodon.social, or their name is different, or the search is bad... But the end result is I can't find anybody there.