If the hinge bit doesn't correct it, here's how the body shop will.
2x4 or 4x4 block covered with a rag, sitting on a jack. Put jack with block on the liftgate bottom at the latch end. Jack up the jack, slowly/carefully.
Let off pressure and check. Repeat as necessary to realign the gate.
Check latch adjustment, adjust as needed.
That's how it's done.
I've also seen it done with a big long pry bar and block of wood.
And even had one tech, bear of a guy, who would just grab the bottom of gates or doors and pick em up by himself to tweak em back into place.
As weak as the jeeps are you could probably do it that way.
Just be sure the gate is nearly closed when you do it. If you have it open too far all you'll do is buckle the bed at the hinges.
97 Sahara, 74 Renegade, 72 CJ5, 55 Willy's (the Beast) Boss 302, 6:34 gearing, Bose 901 speakers.
God I miss that Jeep. Forgot the kinda Jeep, 80 SX4.