Most universities accept all the level 3 quaifications, with the exception of some super elite universities. It doesn't matter if you have to resit an A-level as the certification won't say its a resit and UCAS only logs the qualification and the date it was passed. The universities just care if it was passed with the grades they require. With that said, don't feel pressured to retake them if you feel it's not the right path for you.
With the wealth of A-level, BTEC, T-level and access courses out there, you're bound to find a way to get into uni that suits your needs and abilities. If you already know the university/course you want to join then look at their admissions criteria and do courses they actually accept. I don't have any A-levels myself - I did a 2yr BTEC instead of A-levels and got offered all 5 of my choices based off of that 1 BTEC and the volunteering experience i had in the field i was applying for.