its a bit more complex. If we bet, we are only getting called by hands that beat us. Villain having a flush draw is unlikely since he donked then called the flop. Straight draws would only include 53 or 75 which shouldnt be in his calling range preflop (though it is 2nl). So really, the only hands left are 2pr+, KK+ and pairs lower than a J such as TT or something stupid like A6 for a pair of sixes. All the ones that we beat now, will fold to a turn bet (or should) while all those that beat us would call, bet, or raise anyway.

If we accept this as true, then the only way we get more money is if villain bluffs the river.