good spot to bluff?

pokerstars - 30/60 NL (6 max) - Holdem - 5 players

CO: 67.53 BB (VPIP: 14.95, PFR: 9.71, 3Bet Preflop: 4.55, hands: 108)
Hero (BTN): 76.43 BB
SB: 87.93 BB (VPIP: 22.86, PFR: 2.86, 3Bet Preflop: 0.00, Hands: 36)
BB: 108.42 BB (VPIP: 28.17, PFR: 16.90, 3Bet Preflop: 4.35, Hands: 73)
UTG: 42.48 BB (VPIP: 25.32, PFR: 16.90, 3Bet Preflop: 0.00, Hands: 79)

SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has Kc Jc

fold, CO raises to 2.58 BB, Hero calls 2.58 BB, fold, BB calls 1.58 BB

Flop: (8.25 BB, 3 players) Tc 9s Qd
BB checks, CO bets 3.97 BB, Hero calls 3.97 BB, BB calls 3.97 BB

Turn: (20.15 BB, 3 players) Ks
BB checks, CO checks, Hero bets 6.85 BB, BB raises to 20.1 BB, fold, Hero calls 13.25 BB

River: (60.35 BB, 2 players) Js
BB checks, Hero ???

i think he would rather 3b AJ preflop so he don't have many Ax and don't think he checks if he hit flush so most of his range are Jx. Good spot to go allin and push him out from split pot?

I would check behind here and see who won the pot.

What did you do what was he holding in the end? A?

I think, the river decision is a bit meh. To me the more interesting point is, that we ended up playing the board on the river, because we took a passive line on all previous streets. Preflop we could have 3-bet, but instead we just called. On the flop we had the nuts, but we just called. Especially that decision I really dont like. I think, we are leaving a ton of chips on the table and just allowing ourselfes to be screwed by board runouts like this.

I like your call on flop.I would bet bigger on turn.

I don`t think that villain would fold.

Passivity and unwillingness to protect your hand after the flop brought you to a standstill. Now, instead of a simple check and clarification of the situation, you are going to risk the whole stack to make sure that the villain does not have an ace.