OP did not share a full hand history including positions, stack sizes, preflop action and table dymanics if any. But in a vacuum with the information given I dont hate, how the hand was played.
On the flop its very much a way ahead way behind situation, especially if its a rainbow board. The opponent either have AK, KQ, KJ, K8 or 88, in which case we dont really want to get raised and potentially lose our entire stack. Or they dont have one of those hands, and then they are probably not paying us off, if we go bet, bet, bet. This is especially true, if we dont think, their range is wide enough to contain K2-K9.
Then on the turn we fill up, so now we are happy to play for stacks, but if we raise, they are probably going to fold all their draws, any airball bluff and perhaps even hands as strong as AA or QQ. So unless they just dont have a fold button, we only get action from very strong hands like AK, KQ, KJ, K9 or 88, that we coolered, and we will get action from those hands on the river anyway.