is it a bad plan overall. No. But your execution is not great IMO. the turn is min donked and you only make it 300k in to 1mil + pot? Also river the total to call is 300K so total 400k. That is less than a 1/3 of the pot. You need to put way more pressure on.

And after they call the turn raise you are not considering their hand or what your range looks like.

I would fold on turn. Villain's donk bet may induce us to think that he has nothing, but he called you and the turn didn't bring any card to help you. When he bets on turn he kinda says that he's not going to let it go and bluffing wouldn't work...

not a bad idea on the flop to raise the K high board, but not a good turn card to try it again. a heart or an Ace on the turn is better here. you picked up more outs on the turn and if you think he 'll fold when the 3rd heart comes, maybe its not a bad turn raise to set up a big river bluff when the heart hits, or to build the pot for when you make straight. by the river, just fold. he has alot of Kx hands he's calling out of the BB