If you have a favorite community, move to its instance - /All is showing what all the people on your instance are subscribed to so if you’re on an instance with people you like, c/All will probably have more things you like. Also /Local shows you local posts from your instance which is cool if you’re on a theme instance.
A really small instance may have less /All content (but if you’re on any instance over 500 people it’s probably plenty)
If you have a favorite community, move to its instance - /All is showing what all the people on your instance are subscribed to so if you’re on an instance with people you like, c/All will probably have more things you like. Also /Local shows you local posts from your instance which is cool if you’re on a theme instance.
A really small instance may have less /All content (but if you’re on any instance over 500 people it’s probably plenty)