Came here since the Reddit 3rd party app fiasco. Initially I blocked a load of non English language communities which at the time seemed to fill the All feed. Kept adding to my subscribed communities list then in my app (Voyager after Liftoff stopped being developed) blocked a load of keywords, essentially Trump/US politics related.
Now my Home (subscriptions) feed has some great content. I check out All from time to time to see if I can subscribe to more communities.
Niche communities are still lacking but hopefully that improves over time.
OmsAnd can seem daunting for new users. I persevered because the map info is so detailed & it works offline. On a couple of occasions my family found ourselves in a new city in a foreign country in need of food etc & OsmAnd has had the info telling us exactly what we needed & where to go thanks to the dedicated community. It encouraged me to map my own city suburb in detail to help fellow travelers.
I also love its offline Wikipedia function.
If anyone is interested, even adding a park bench or litter bin helps & is quite simple with something like StreetComplete