Do not 4bet. Fish don't fold.
No need to roll vs fish, that implies balance and you never balance vs a fish.
I have old fish data but does fish data actually ever get old? Seems like the definition of a fish is they don't change their strategy.
Looks like a fold. Fish also have sizing tells, when they Overbet their bluffs are greatly reduced. I actually remember a poker detox gem saying that fish over bluff every sizing EXCEPT Overbets.