During reassembly, perform the following:

If you're reusing your screen, use tweezers to remove big chunks of adhesive from the perimeter of the screen.

Repeat for any adhesive on the frame, including the small adhesive at the top right of the phone.

If your top right adhesive is still intact and sticky, you can reuse it.

Use isopropyl alcohol (>90%) and a lint-free cloth to remove any remaining adhesive residue.

Follow this guide to replace your screen adhesive.

If you don't have custom cut adhesive strips, use double-sided tape, like Tesa Tape, to secure the screen to the frame.