Oxbridge?

I’m in year 13. I have been mulling with this idea for a while. I’ve had significant health issue which caused a massive disruption in my education which meant my attendance was at 44%. I have won gold and silver in the chem Olympiad and Cambridge chemistry challenge but I couldn’t always come in and so I ended up on results day coming out with an AAB. In maths art and chemistry A level respectively. I’d be doing the autumn exams to get both up to an A*. I am also wondering whether or not to do the exam in art as it is getting appealed as a cohort. I am interested in doing chemistry (A*A*A) or biochemistry(A*AA) at Oxford but I was wondering if it was worth me applying this cycle for 2021 entry. I don’t hold any offers currently as I did not apply last year due to health concerns but I am improving after having started my treatment this year. My referee can explain these as mitigating circumstances.
Any advice will be very much appreciated.