How do I get back into windows 11?

Firstly, I am not well versed in computers at all and I should not have attempted this by myself. I was trying to dual boot windows 10 and 11 on my same PC but after downloading windows 10 onto a different partition (at least I’m pretty sure) I am no longer able to access my windows 11. I have tried absolutely everything to try and boot into my windows 11 and nothing has worked. I am very upset since all my files and everything are on windows 11 and I am actually stuck in windows 10. Does anybody know what I can do? or could help me further?

sorry I am so dumb.