How to play 4 to a flush

I would squeeze bigger preflop, at least to $0,20. Then I would cbet flop 2/3. There are alot of worse hands that would call. Turn club is not the best card, but we still have the best hand often enough and a nut flushdraw, so I think we can cbet something like 1/2, but we can also check/call, maybe 50:50, depending on the opponents (if they are more fishy/passive, then we cbet). As played, I think we can shove the river because we have pot sized bet. I expect sets to raise flop/turn, so I'm not afraid of fullhouses that much. Villain can call with 9x and worse flushes.

I would squeeze a bit bigger pre.
Our Ac blocks quite many flushes from villains' ranges and if they happen to have some kind of a flush now, we have a re-draw to the nuts. So I don't think turn card is so bad for us and I would likely keep on barreling. You don't have to go super big imo. About half pot leaves you a reasonable stack behind OTR.

OTR you hit the nut flush but the board paired. CO called vs UTG open, then he called a 3bet and he didn't raise you OTF. I think because of those things we can think he has that full house quite rarely. But he could have K or Q high flushes here that he just can't give up. I think I would shove.

preflop: I learned to squeeze with 3,5x + 1x per caller. That would be 0.18 at least; if 0.18 are called, 0.20 or 0.22 are called also, you have the best hand preflop, get as much money in as possible.

flop: There are not only flush draws but also some straight draws, and there are 2 opponents. I would bet 3/4 pot.

turn: You might have the best hand, and you have the nut flush draw. Bet, but not too much.

river: Since there were no sets on flop or turn (they should have raised), there is no full otr. But there can be strong flushes. Or trips 9. Push.