I don't see anything wrong with fonts or the UI in Linux rn. I had tried Linux multiple times back in the 2000s and early 2010s and you are right, it used to look bad compared to windows and macs.

But if I am being very honest here, Linux looks better than both windows and mac currently. Either GNOME or KDE Plasma easily look much better, just pick the one you prefer. There is also Cinnamon.

It is not hard at all to find the one you like. As I was installing Debian 12 there was a list with checkboxes to select the GUIs I wanted installed and I just installed all of them, then whenever you startup, on the login interface where you have to insert your password, there is a dropdown list to select the interface you want to use, and you can change back and forth between all of them as much as you want, this is so much better than windows by itself (if you want to have options to change the look of windows that is a lot more work, Linux on the other hand has a bunch of well tested, trustworthy and cohesive interfaces ready to go, you just select them on a list.

For me I like GNOME better, thousand times prettier than windows 10 that I was using before. Most people seem to prefer KDE Plasma tho. Just have a look at them, ain't no way you will come out thinking they lack anything compared to windows.