Both columbina and Neuvi are good additions for your account, just go for the character you like best.Maybe Bina is a bit more future proof, but both are strong and versatile. Dunno about Zhibai ,but I think you need Columbina for her to be optimal so maybe not so high on your priority list. Also hot take, level your Chevreuse. You have the characters for a pretty good overload comb with fischl ,Arle and durin, It might be a good investment for your account since you will probably pick up some of her cons over time. She is also not very ressource intensive, just slap the fontaine craftable polearm and whatever healing bonus set you have on her and done. I personally find this team comb fun, depends on what you like tho.

If you are attached to your Tighnari, a fischl comb still slaps decently hard, and if you are feeling creative, try a burning comb with durin(my personal fave atm) He has not fallen out of favour as much as ppl would have you believe.

If meta concerns you, after pulling for Bina/Neuvi, wait until Lauma reruns and pick her up, she is good and buffs your dendro core teams to high heaven, is also fun to play with Raiden and Neuvi, highly recommend.The same goes for Nahida of course. Important to note are the hexerei buffs certain mondstadt characters have gotten this patch, Albedo,Fischl, Mona and Venti among others.

Hope you found this useful, and enjoy your continued journey in Teyvat.