Should I redo the year? (Engineering)

I didn't get invited to an interview from Cambridge (Engineering) - bit disappointed as I put quite some effort preparing it for all of it go to waste, due to a number of different reasons (tanked the ENGAA, only 3 A-levels, mediocre GCSE grades, bad habits etc.)

I've already received offers from 3 offers from Russell Group Uni's and I'm very likely to get an offer from my 5th option.

I honestly think I had the ability to go to Cambridge, but not the effort and dedication required to do so, as I still play video games or go out, straight after college, whilst leaving homework or revision to be done at 11pm until like 1 in the morning. To be brutally honest to myself ,I've just fallen off since lockdown (remember that?)

This is why I've been wondering whether I should take the chance and retake the year after this second year, or just accept that I'm just under the bar for Cambridge and put this behind me. I was taking a 4th A-Level (CS) but I dropped it because I was "too lazy" to do coursework. Right now I'm studying Maths, Physics and FM.