More competition with other swordsmen wanting to become the WSS, with Zoro having some real rivals in the lot.
Make him more prone to show his emotions and more vulnerable side more often. That's why he's more interesting when Tashigi is around because she's the only one to whom he can show them.
Give him some real character development with him becoming more mature and wiser and showing some hidden side, instead of him being dumber and barely more intelligent than Luffy.
Him going to Ryuma's grave during Wano arc, and discovering his origins, as well as more lore on special swords and black blades and how they are made.
Make him more prone to show his emotions and more vulnerable side more often. That's why he's more interesting when Tashigi is around because she's the only one to whom he can show them.
Give him some real character development with him becoming more mature and wiser and showing some hidden side, instead of him being dumber and barely more intelligent than Luffy.
Him going to Ryuma's grave during Wano arc, and discovering his origins, as well as more lore on special swords and black blades and how they are made.
He has so many chances to create cool strong swordsmen for zoro to face since ts and all he came up with was pica,hyozou,monet,


I think he s afraid of zoro overtaking garbage like goofy in pop polls so he does the least with him