top2+fd facing gazillion actions

20plo - clubgg - min35 vpip

Hero (CO): 100 BB
BTN: 184.2 BB (VPIP: 58.14, PFR: 11.63, 3Bet Preflop: 2.94, Hands: 112)
SB: 335.75 BB (VPIP: 100.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 4)
BB: 110.35 BB (VPIP: 75.51, PFR: 10.20, 3Bet Preflop: 8.70, Hands: 62)
UTG: 40 BB (VPIP: 27.27, PFR: 9.09, 3Bet Preflop: 9.09, Hands: 31)
MP: 111.9 BB (VPIP: 82.44, PFR: 5.34, 3Bet Preflop: 4.84, Hands: 170)

SB posts SB 0.5 BB, BB posts BB 1 BB, UTG posts penalty blind 1 BB

Pre Flop: (pot: 2.5 BB) Hero has A♠ Q♥ 7♥ 5♠

UTG checks, MP calls 1 BB, Hero raises to 3.5 BB, BTN calls 3.5 BB, SB calls 3 BB, BB calls 2.5 BB, UTG calls 2.5 BB, MP calls 2.5 BB

Flop: (21 BB, 6 players) 7♦ 2♥ A♥
SB checks, BB checks, UTG checks, MP checks, Hero bets 21 BB, BTN raises to 68.25 BB, SB calls 68.25 BB, BB calls 68.25 BB, fold, fold
Hero???