This hand sparked me some question

You can see Villan's hand, so we have a clear call OTT as we improve more than actual pot odds.

What would you do if Villain would bet more like 9 into 14,2?
We will be OOP OTR and when the obvious flush came, he can fold without comfortably.

Doing some math, we need to gain 10BBs OTR in order to our turn call to be profitable...this means on average I gotta donk and get a call 100% of the times for example which is quite unlikely...

I need some guidelines in order to improve my thinking process, maybe a turn raise is better, maybe a turn fold is even better... why?