I am not a fan of the 4bet because A7o does not play well in 4bet pots, would rather do it with a2s-a5s and blockers like KJ KQ AQ.
Flop I'd just be giving up, don't expect to fold any pocket pair or draw, we only really fold out AQ if we put their range at 88+/AJo+.
Turn is a spew because I don't think it achieves anything, don't think any hand folds the turn that called the flop.
Fold to the 3bet and pick better hands to fight back with.