how can i fix my trunk?

seek help from a bnz mech this can be tricky

Ensure that nothing is in the way blocking it, or anywhere on the weather stripping. Also ensure nothing is blocking the hinge arms from inside the trunk. If there is no blockage or damage then it would have to be looked at from a shop for further inspection.

First off check your battery your battery don't have enough amperage in one unlock your lift. Second you might need a new lifting latch so it might need to be replaced the lock mechanism