Since some time ago, like a week, Iβve been experiencing that the home feed only has a few posts and sometimes it is empty and shows the message to subscribe to communities.
I checked going directly to the instance web page on the browser and it shows my home feed full.
iOS: 26.5.2 Voyager: 2.47.4
Do you have any app specific filters? If your app is filtering on a common word or domain then there won't be much. But the web frontend doesn't have those filters. I did something similar trying to filter out all Americans with the keyword "US" in the Thunder app but then I filtered out a bunch of posts to my instance (sh.itjust.works)