[JTG51]

Not raising preflop was a significant mistake. Not only do you likely have the best hand, but it also plays very well multiway.

Waiting till the turn to raise is fine (although I'd raise the flop a lot of the time also) but I don't like waiting till the river to raise on a board where your opponents could be drawing. You'll miss out on the chance to collect bets from them on the river when they miss.