Messed up my system while updating Qt manually

FIXED: I ran pacman -Syu again from the terminal with Ctrl+Alt+F2 and identified the error preventing me from updating the whole system; looked it up online, had to rename a couple of confilcting files, reran pacman -Syu and I was finally able to update everything as it should and the system booted finally

I was trying to use k3b but it asked me for Qt 6.12 and I had 6.11. I tried updating my system from Welcome, but it gave me an error at the very end which I didnt give enough importance, and I wasnt willing to redownload 3gb again just to get that error, so I decided to update manually each qt6 package with yay. After I was done, k3b was still not opening but it was asking me for ffmpeg, and trying to install ffmpeg gave me a bunch of errors saying that would mess up some other package's dependencies, so I just gave up. After this I noticed I wasnt able to open any new windows, not even the terminal, so I thought maybe I would have to restart. After doing so I am now stuck at Reached target Graphical Interface and nothing happens after that. I have zero idea how to solve this. I have access to another computear with EOS as well so please help me fix this without having to reinstall the whole system:(