I would like to see recommendations for communities based on my communities. It’s not trivial to solve, but discoverability isn’t great right now.
Problem here is also that your instance may not know about all communities from the instances you’re connected to. This could probably also be improved.
Recommendation algorithms are a big reason for the enshitification of other social media. You don’t need to be connected to everything everywhere all at once. Enjoy your handful of small communities.