For instance, I made an account here in Lemmy.world because it seemed like a nice, well rounded place to start. However, I want stuff from TTRPG.network to show up when I browse my “frontpage,” but all I see is my Lemmy.World communities.
I’m using Liftoff on Android at the moment, but I’m a newb, so I’m clearly not tied to that app.
Perhaps these communities you follow from remote instances are not very active, so your subscriptions from lemmy.world (which tend to be larger and more active communities) are obscuring them.
I suggest you change the sorting order to “New”. I found that the default “Active” sorting always shows the same trending topics for days. Reddit also had this lazy refresh cadence with its “Hot” sorting, but to a lesser extent.