Sanji's fight is going to be with perospero. His arc in wano will most likely be connected to big mom, given what happened in WCI. Furthermore, big mom has captured Nami, so by default, he's going to have to have some conflict with her.
Perospero is a major villain of wano kuni, imo. He has got more screen time than any of the tobi roppo and he was a main villain in WCI as well. He was directly responsible for the death of Pedro(who sanji is close with), he is the de facto leader of the big mom pirates during wano, and he attempted to kill the vinsmoke family during the tea party.
I think the last part is kinda significant. So far, we have absolutely no idea what happened to the vinsmokes. If something bad did happen to them, Oda could easily use that to create a ton of drama during his fight with sanji.
Also, its important to note that Perospero is portrayed to be one of the strongest big mom pirates, he has a bounty that rivals cracker's, and he has shown signs of having devil fruit awakening. So while sanji did show superiority against page one, it doesn't mean that Perospero will be an easy fight for him.
Also, Sanji fighting Queen would just seem kinda off. I did have this headcanon about how his flames could counter Queen's plague, but even still. Queen is a swordsman with an ancient zoan. With what he's shown so far, I don't think Sanji has what it takes to fight a strong swordsman.
Queen's fight should be eustass kid, imo. They have drama and imo Kid is more important than sanji.