KK correct?

[mike l.]

500 max buy 5-10 blinds, good game. im big stack with about $3000, no one else is close. 6 or 7 handed, i have KK utg and limp, next guy limps, next guy who has been raising a lot makes it $40, button who is a fish cold calls, sb and bb fold, i make it $300 straight, only preflop raiser calls. he auto-calls. he has $700 left.

the flop is QJ9 rainbow. i put him all in.

nothing else i can do right?