What should I do with my rear crossmember?

These are what you need 2nd one goes behind the cross member gotta pull the gas tank to install but it makes everything really solid sorry No. 2 is the outer there is also an inner that is the one you pull the tank for

https://genright.com/products/rear-frame-to-bumper-tie-in-bracket-kit.html
Outer

https://genright.com/products/rear-cross-member-plate-tj-lj-yj.html
the inner

https://genright.com/products/inner-reinforcement-plates-tj-yj.html
The Inner and the Frame Tie in Brackets are what I used, I have been happy so far
I just installed these items, super stout