heres the thing Wano is the longest arc/saga in the entire series. most "peak" moments for OP new gen of fanbase comes from "fights"
& the peak moments people will mention are zoro v king cause of anime adaptation, sanji vs queen (sanji powercreeps), ending of luffy vs kaido again anime adaptation carries heavy.
but here is the kicker there are tons of "smaller" moments that should actually be considered peak:
Yasuies Sacrifice, Jimbei's Official Joining, Odens Boiling Sacrifice, Namis undying loyalty to Luffy and PK status, Robins Demon, Kanjuros Betryal, Zoro vs Killer...