He's already >YC2 and will probably fight an Admiral (Kizaru or Greenbull), so he has all the time and possibilities to increase his CoO and CoA more if he's already this good beating a 1.32B guys mid diff.
Sanji as a character doesn't need to become the strongest of all like Zoro and Luffy.
Comparing the three of them is not something that I use to do, I've always said Luffy>Zoro>Sanji.
I'm already more than fine that my boy has become this strong, a cook who doesn't even like fighting but is already in the top 30 of the verse before EoS.