been there, done that

Từ điển Oxford Advanced Learner 8th

ˌbeen ˈthere, ˌdone ˈthat idiom
(informal)used to show that you think a place or an activity is not very interesting or impressive because you have already experienced it
•Not Spain again! Been there, done that, got the T-shirt.
Main entry: ↑there_idiom