So if you mess up, which you will! You'll need to pay for a new uppercase (aprox $1,000 USD) or what I would do is replace the broken parts which is a lot cheaper!
As we can't see what broke (post a picture or two) [guide|21499] I can't tell you if that's possible here.
One source for KeyCap parts [https://www.thebookyard.com/apple-keycaps-clip-select.php?cPath=66_510_499_725|MacBook Pro Late 2019 - 2020] Click on the image of your version.