Villain is a 30/1 fish. What's our river bet sizing?

I did a river shove, but looking back the line is so strong that I don't think a A/Q can call.

PokerStars No-Limit Hold'em, $0.50 BB (9 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

saw flop

UTG+1 ($50)
MP1 ($79.20)
MP2 ($52.95)
MP3 ($107.55)
CO ($62.20)
Button ($50)
SB ($48.70)
Hero (BB) ($88.80)
UTG ($50)

Preflop: Hero is BB with J, A
2 folds, MP1 bets $1, 1 fold, MP3 calls $1, 3 folds, Hero calls $0.50

Flop: ($3.25) 3, Q, 7 (3 players)
Hero checks, MP1 bets $2.50, MP3 calls $2.50, Hero raises to $10, 1 fold, MP3 calls $7.50

Turn: ($25.75) A (2 players)
Hero bets $22, MP3 calls $22

River: ($69.75) 3 (2 players)
Hero bets ,

Total pot: $69.75 | Rake: $3