- On clicking a username on any post or comment - it should be easy to follow that users posts. There can be a subscribe button on the users profile page - there can be a view of all the latest posts by that user.
- users can decide to add their approximate GPS location randomised in a 50 kilometer circle - posts from people nearby that circle can be made more visible in the nearby section
pull down to refresh
related posts
I think your first idea is already in place. Check this out:
https://m.stacker.news/13943
increasing the visibility of the subscribe button
like a twitter follow button