Cant understand what happened in this hand.
Basic concept should be:
1) The more laggy our Villain , the easier we stack off
2) The tighter/nittier our Villain, the harder we stack off

I cant understand why you folded. If your plan is to fold with future two pair, then just raise OTF und get it in. With your hand you are basically never bad at least.

From Villains perspective:
1) Hero flats his Iso raise
2) Hero calls flop and doesnt shove turn -> Hero doesnt like the A on the Turn? Hero is weak? Hero got a weak flushdraw? Hero showed weakness by not jamming? ....
3) Hero got maybe Ax, a busted flushdraw, I can shove any 2p+ for value or bluff him out of the spot.

I would based on history raise OTF or at least OTT. He can have every lower Ax combo two pair, with which he isoraise whale for value + you got the Outs to the nuts and he can even call with a worser combodraw

And last question:
What range are you calling in this spot?
With what a range are you calling in this spot vs a tight regular?

I mean the biggest problem in your hand was, you didnt have a plan, what will I do on the next street and what is if Villain continues with his aggression. The best play would have been to raise the flop and try to get it in. Even when you call him down and hit your flush, dont expect any thinking player to put much money in it anymore.

I would raise the turn vs this player. As played, I don't think villain has any bluffs OTR except a random combo that he decided to barrel off and very few missed flush combos, since you block most of them. He needs to be bluffing more than 33% of the time for you to profit. I don't think its the case here. Tough but I think would fold.

I think it is fairly standard until the river. OTR I really don't think he will have bluffs(unless he's a crazier one), as players tend to be very valueheavy with these sizes. So the question is if we have enough EQ against his value range, which I don't think we do.

Even against a wide valuerange like this:

AA, JJ-TT, 77, AJs-ATs, KQs, JTs, 98s, AJo-ATo, KQo, JTo

we only have 31.8% EQ, and I doubt he will have all AT combos or he might not even iso with JTo.

With these said, if we think he's capable of bluffing enough K9s, Q9s, Q8s, 8c6c kinda hands like this, we will certainly need to call top2 because our range is quite weak, unless you slowplay KQ, 98s, TT, 77 a fair amount.

I also think Your play is fine, and +1 to what Will said, U need to call sometimes if he plays enough K9s, K8s, Q9s, Q8s or something like this way.

Otr, he shouldnt be shoving with less than a set, imo. You block most of his flushdraws which would be his primary bluff candidates. So the way you played the hand, x/folding river makes sense a lot actually. I think you can still x/raise flop or turn and never feel too bad about it when you get called.