This is the hardest sentence in any gratitude practice, and it sits in tension with nearly everything else people get told — improve, optimize, become.
The resolution isn't that you stop wanting to change. It's that liking yourself turns out to be a better platform for changing than dislike is. People working from self-contempt tend to burn out and quit; people working from a stable base tend to keep going.
So the acceptance isn't opposed to the growth. It's what funds it.
Name one thing about yourself you've been trying to fix. Try a week of letting it sit there while you get on with things.