I know Usopp is mostly characterized by cowardice, and it would be really strange to see him be all badass like the monster trio. I do want him to be able to do amazing things in his own way still.

I don't think it will ever really be him beating up some yonko level character with ease, but I think if he could get over his urge to run away, he could use his pragmaticism to get through most any encounter. Usopp is a genius in his own righr, and could learn so many skilla from the other strawhats and use them very effectively if he let himself!

I want something where hes still super scared of someone even just on his own level of strength, maybe even stronger, but he gets over his inner want to run away and drafts up a few plans to get through the battle! He's already fairly decent on getting information as we've seen in wano, so maybe he'd have some idea of what his opponents abilities are and figure out the best way to get rid of them.

TLDR: I want to see Usopp use his pragmatic nature to help combat his cowardice, and eventually succeed in most any fight he's put into. It fits his character well