YSK: You can use wefwef.app (Voyager) to import your subreddits

Recently wefwef.app added an option to add the link to all of your reddit subscriptions (multireddit link from old.reddit) and search for replacement subs. You can pick which communities/instances you want to subscribe for each sub.

You should know this because it can make your life easier if you want to search for communities you're familiar with.