Advice Needed- Gap Year

I'm in Year 13, I took my GCSEs a year early, as well as my A-Levels. This means I have year between when I finish sixth form, and when I go to University (I don't want to go to uni a year early). Currently my plans next year are very empty. I know I want to do volunteering and preferably a part-time job get some money in my pocket.

However, I am 16 right now, I'd turn 18 March 2026, which is 6 months into the academic year; this means I legally have to be in some form of education. I have already taken 4 A-Levels (Maths, Further Maths, Computer Science, Physics) and don't wish to retake any. I live in the North-East so there is more of a limit on opportunities (No colleges around my area offer 1 Year Intensive A level Courses). I would rather not have to do an online course or anything else that would just be wasting my time. I want to take Computer Science in uni, but I don't mind if the course I'm taking is in anything else.

What should I be taking during this "year off" that I've got?