I straightened up a maple a few years ago by staking on one side with a T post and pulling it. It wasn't quite that big. You would need something solid to try that method with that tree. Concrete in a post and pull it??? Wouldn't look too pretty, but your options may be pretty limited.

I'd leave it alone, if I were you. Chances are that in 5 or 10 years it will straighten on its own as it gains girth.

If I wanted it straightened, I would straighten it. The last few I have straightened I used Tee Posts. The hardest one was one that I mixed concrete in gallon buckets with a short piece of chain in. I removed the sod and dug holes to bury the buckets with the chain sticking through the sod I replaced. You can run an RV resistant rope through the chain and adjust as needed, of to unhook if you want to mow the area. After a couple of years the tree looked good and I just buried the chain there above the bucket to have if I needed it again.

You will want to do something to protect the surface of the tree.

Its always been a bit of a gangly weird tree. I think we went for height when we bought it but it is a bit heavy to the front, hence the leaning. Perhaps it would straighten out on its own? If so, I would just leave it. Also wondering if trimming some on that right side would relieve some pressure and help it straighten if it starts growing more even. I have never done much trimming on it so I wasn't sure what if anything should be done.