Best practices, scene effects etc

Hi! I create game for long time and mostly was focused on technical aspects like c++, assets creation etc. There is a lot of work still, but, when main functionality is almost done, I’ve started thinking about overal picture what game has.

For now the picture seems too simple, not contemporary. Since I use UE 5.1 not Unity :), I’m interesting: how can I improve game picture without critical loss of performance using built-in UE solutions?

I tried to play a bit with post effects but only Detail strength looks interesting for me as single checkbox try ) Adding particles everywhere: may reduce dramatically performance and hard to implement with randomly generated maps. Same for ligthing: I can use only dynamic lighting, because nothing to pre-build.

I am more of a technical person than an artistic one, so even if I spend lot of time for searching videos, I can miss something important.

So my question is: What can I do to make picture more contemporary?
Would be appreciated by any suggestions, links etc.

PS:
examples of different modes:


PS1: I will definitely change UI )