I'm not sure if I would even contibet here on this flop against 3 villains. You don't have a strong hand on flop, and the board is very drawy and against 3 villains you get called here way too often to make the contibet profitable. I would play check/fold on flop.. (or call a very small donkbet and hope to hit one of my 3 outs on turn

)
Also the turn check/raise is pretty horrible in my opinion as villain commits himself to the pot with his bet and you don't create any kind of fold equity with your raise. At this point you can only hope that from the huge variety of hands villain could have, he's under the only ones you can actually beat - flushdraw or straightdraw.