took a gap year for mental health reasons

i struggled immensely with bulimia and psychosis in year 13, so i gave myself a year break to recollect myself. i'm now doing substantially better, but the issue is, outside of supercuricculars (reading, watching documentaries, studying maths in my spare time, chess etc) i've done no travelling, no working (only because my mum wouldn't let me, that's a whole different topic), no volunteering and, well yeah. i wish to take another gap year as i'm not 100% firm on my choices for university, don't feel any sort of excitement or passion for my course and want to apply for oxbridge. (cambridge specifically). i feel like this will disadvantage me greatly and there's no point in me taking another gap year.. besides cambridge i wish to apply for warwick, UCL, maaaaybe LSE and manchester. i've of course already acquired my grades at an A*AB (i'm applying for a FY at cambridge since i'm eligible) but still, any advice for someone like me? it feels ridiculous that i've spent my gap year like this but i truly needed a break above everything else and it's not like i've been deliberately avoiding work. don't have any excuses for the non-existing volunteering i guess, and well for the travelling i just simply do not have money.