My one issue with Zoro post timeskip is how stagnant his character has been. Oda still provides him with the cool highlights here and there, but he lacks those really strong character moments he once had pretimeskip. I think back on all of Zoro's best moments, almost all the ones people list are from pretimeskip. And while he has it way better than a lot of the other Strawhats, I can't help feeling he's one such character that's been neglected and is currently coasting off his character arc pretimeskip.
Even in Wano, an arc which has seen more development in Zoro than the last few, it feels like the things Oda established for his arc he's chosen to walk back on.
-Shusui and Ryuma connection
-His relationship with Yasu
-Hatred for Orochi
-Sunnachi
-His connection with the Shimotsuki
They all appear thrown aside after the big chapter 955. Zoro's back to his default state, with no indication to his previously developed plotlines besides the fact they provided him Enma in some fashion. Of course, Wano isn't over, so I don't want to completely rule out their continued developments. But with how much has to get done and how much of it can get focus, I'm not confident in these particular bits getting further emphasis. With Shusui/Ryuma, best I see a short moment between Zoro and Ryuma's grave by the end of the arc. The others, I've little hopes on being followed up. All he went through was to just get him a new sword, and now that he has it, no need to further focus on them.
Still though, my favorite Zoro moment in all of Post timeskip is easily when he encountered Yasu and the people of Ebisu. Always good to see a tough guy shed that persona, even for just a bit, and reveal a good, human heart. A sweet reminder Zoro's more than some catch phrase spewing, deadly badass. Even if he doesn't get much focus later in the arc, a good moment like this is all I need.
Sorry if this wasn't exactly me providing how to make Zoro a better character. Just airing out some of my personal grievances with it.