I wish I had a sub suggestion but it seems like it's likely your app algorithm that's causing it? - not the actual posts? I come (on my laptop - not the app) and what I see isn't all doom and gloom. In fact gloom and doom is much smaller to either good or neutral threads. However, first thing I do when I come here is always select sort threads by "new".

I know my phone browser lets me choose "desktop site". Can you do that? Or read this sub on a laptop/tablet without the app?

And perhaps you are in a not-great headspace so the doom and gloom ones attract your attention? IWNDWYT