Stripped screws on the step 13 - alternative options?

This is my method for stripped screws...

First, I try to find a flat head screwdriver that is just large enough to fit in there but still very tight (maybe even just minutely oversize that I can push in), and try to turn. You can also try flat heads and odd angles to see if this can get a better grip.

Next, I try either tweezers, small needle nose pliers, etc. to try to grip the outside of the screw head, and turn it like a bolt. I like the iFixit blunt nose for this job: Tweezers. Sometimes sandpaper on the teeth of the tweezer will help. This takes patience.

You can also try a small piece of sandpaper on top of the screw, then something flat on top of it, in hopes the friction will turn the screw. Not a high probability of success, but it has worked for me in the past.

There is also this if the above doesn't work: Screw Extracting Pliers

The display assembly does not need to be removed while replacing. While it's god practice to help prevent damage to the cables, it isn't required. make sure you support the display assembly and do not let it fall all the way back and be careful while removing the adhesive strips. I find it helps if you remove the Taptic engine just below the battery before you pull those strips, It gives them a little more room and less to hang up on.

Do make sure those screws for the display are back in the proper place and set all the way in.

Good luck and happy repairing.