Wow! Congratulations on a great set of results. Problem of being so good at a wide range of things is it leads to difficult choices (especially in the system where you have to choose which 3-4 subjects to specialise in in Y12). Even thought there are no ideas about university yet, it might be worth a browse of the HEAP guide to look at course descriptions and possible offers, it might set some thought processes rolling. And below is the Cambridge guidance re number of a-levels/further maths
“Applicants taking four subjects won’t normally be at an advantage compared with those taking three, although competitive applicants for STEM courses often have Further Mathematics as a fourth subject.
For courses where A Level Mathematics is required by all Colleges – Computer Science, Economics, Engineering, physical sciences options in Natural Sciences – students taking A Level Mathematics in Year 12, and A Level Further Mathematics and only one other A Level in Year 13 will be considered.”