Broken screw — any advice?

Previously I posted on here about an issue with my Varla Pegasus rear rotor. Ordered a new rotor, replaced it, good as new. Took it out for a ride, and the front tire started making a rattling noise.

Realized it was the metal piece that holds the brake in place, looked like the screws were loose. Took it home, removed the front wheel, went to tighten the screws, and the head of one of the screws fell out.

The screw broke and the rest of it is lodged inside the metal. I have no idea what to do at this point. And advice would be much appreciated. I just want to ride my scooter. 🥲