I've seen #TwitterMigration people wandering around lost with profiles showing between 0 and 3 follows weeks after joining.
You need to follow people on Mastodon. Follow people with similar interests, follow a person who made a joke you like or posted a cool photo, follow a writer, an artist, a scientist. Follow people from differing cultures and backgrounds. Follow and follow and also, most importantly, follow.
Then cull later. Prune your home timeline like a bonsai.