[Aceium]

AQo isn't a hand that I will call a 3bet with out of position. You're setting yourself up to play some marginal situations.

You've really underrepped your hand on the flop. You should lead out on this flop. Your hand is not good enough to slowplay, and you need to try to extract value from hands like any weaker Ace or any kind of straight draw. Also, since villan 3bet you preflop, he may have a hand like 99 or TT. On the turn I would bet more like $5. Now when he calls you on the turn you have to decide what to do on the river. Whatever it is, don't bet $4 into $15.