Any tree experts out there?

So I've never planted a tree before and this particular one I have planted was already put in by a landscaper the builder hired. It's probably over a year old and I know when I first moved in it was straight but now I've noticed slowly but surely a few inches above the trunk there is a nice bend. I've tried adjusting the stake which really has done nothing. Any suggestions? Is it too late for this poor fella? Pic below.

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