Increasing the shadow atlas and map help a lot and combined with display_reset's AA it looks pretty good now, but I'll probably have to keep performance in mind going forward. It's hard for me to judge it now since I don't have much on the screen visually yet but I'll see.
Thanks for the help! Additionally, would you happen to know any preferred AA systems (shaders or whatnot?) I should be able to find some on my own but if you have any recommendable ones that could help too.