Well, unsurprisingly I've been able to find a decent amount of tech related accounts I followed and I'm sure in time I'll find others again through their boosts, but other groups I followed seem to not be here.

Only time will tell where everyone ends up but for now, the fragmentation sucks.

@EdTheNerd Have you tried Fedifinder (https://fedifinder.glitch.me/)? It links up to your Twitter (read only, dw), and scans your Following list for Mastodon accounts. Super useful for finding folks!
Fedifinder

Fediverse accounts of your X/Twitter followings

@swimmin yup thats how I've found 90% of my follows so far. Good tool.