A few recommendations for life on Mastodon:

1) Follow anyone you think looks potentially interesting; you can always unfollow later, and they may lead you to new people via boosted posts.

2) Boost posts you think are worthy, so others can discover new content.

3) Don't obsess on replicating your Twitter follows on Mastodon; let it be its own experience, and grow it organically. Obvs follow anyone you miss from Twitter, but this isn't a 1:1 replacement; have fun, follow your instincts.

@davetroy
However, if you do recall somebody on Twitter you want to find, save your followers there now. I am thinking there is a small chance Twitter will just 404 one day. Reading thru your local list of contacts can trigger your memory of people to add here.
@lauxmyth totally. I would just do that manually than trust a machine to do automatic adds.