raise mediocre hand and nail the flop

[Crusher19]

I raise Q 9h UTG get 3 bet cut off, and the big blind calls two more. Flop Q 9 2 rainbow. i check, cut off bets, big blind raises, I 3 bet, and cut off caps. Turn 4, great card i bet, cut off raises, big blind calls two cold, i 3 bet all call. River 4 for a final board of Q 9 2 4 4. My problem in the hand is what my river action should be?