software that works well in wayland see https://arewewaylandyet.com/
on KDE select "Scalling themselves" under "X11 legacy applications" on display settings will fix blurring scaling on most of application but some will look strange (small icons and so on), you can fix it by adding
GDK_SCALE=2 GDK_DPI_SCALE=0.5
as envinroment variables to applications that won't scale correctly.