Could be the photos but I dont see it racking. The front view looks like the right side is out but the left side looks straight. If it was racking a level on both front corner would read the same. The roof looks to have a dip also.
That's why I thought it might be foundation issue.
You really need to clear out everything you have stored in there and then get a framing contractor out to inspect it and tell you what your issue actually is. I think it's a foundation issue and it's foolish, and dangerous, to just attach a come along, trying to square it up. At least until you figure out the cause.
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