glad you've managed to keep yourself busy during isolation!! and also well done for narrowing down some ucas choices, i've been trying to do the same myself with limited success haha.
as for Oxford - I initially ruled it out because the course I wanted to take made you specialise, and none of the options available for that appealed to me at the time. I later changed my mind abt my course so considered oxford again because I absolutely LOVE it as a place but ultimately ruled it out again. as much as I'd absolutely love to study there, personally I feel like the standard at which you're held for your work would become too overwhelming and competitive for me personally. of course you should work hard in university and achieve your best grades possible, and I am stereotyping a bit here, but I don't want my entire uni life to have the cloud of 'oxford expectations' hanging over me. not sure if that made sense haha but I hope you kinda got the gist of what I meant? I may regret it in the future because as I said I do really love the university and Oxford as a whole but it feels like a lot of extra stress for a university that, despite it's high reputation, isn't necessarily the number one choice for the degree I want to do