I play lower stakes but the flop bet seems pretty ambitious going 4 ways to the flop, yes they shouldn't have many 3x but when there are 12 other cards out there there is still a pretty decent chance that one of them binked at least trips.
Not sure on how to play the turn and river, again not sure if my reasoning is right, just my thoughts.

Yea, I think there are too many opponents, If I were to bluff here, I'd like to see the flop check tru and start betting the turn with more info. (I can still rep a boat that wanted to c/R flop). It also depends on your opponents. If they are loose, fishy, I would not even start this bluffing (coz they are not aware of ranges - BB-hit this hard...). As played u probably have to jam

i would give up, look at what are u even trying to fold? his range is straights and full houses, he is never folding FH and you dont know how big percentage of FH is his range, in addition you dont know his tendency if he is so fishy he will call straights. i really dont like to bluff in this spot because his range is very well defined (too narrow) and his call tendencies are unknown