Raise more on the flop. This will build a pot and get everyone else more emotionally attached it. When you flop the 3rd flush, you've got to believe it's the best hand until given good reason to believe otherwise. Good reason never came in this hand.

Turn bet 1/2~2/3 the pot. Get some money in there and make your river value bet nicer.

River: I said value bet! You're pretty sure you have the best hand and you want calls. Bet a decent amount and maybe get a caller.

-'rilla