The art subs, like r/art, graphic design, art nouveau, and all the AI art subs. I was mostly a lurker on those ones but they were really great eye candy.

Also things like earth porn and the nature subs. Was nice to see cool places in my feed.

And the local community subs. I think that will take a long time to develop (if it ever does). I used to get a lot of news on city events from Reddit and without Boost on my phone I’m feeling out of the loop