Add these two lines to ~/.Xresources and re-login
or run xrdb -merge ~/.Xresources to activate.
For Xft.dpi uncommenting and adjusting line 7 is fine, too.
Just remove the leading ! and replace 96 by 160.
Xft.dpi: 160
Xcursor.size: 48
These values were found giving the best results but depending on your screen's resolution ymmv. Adjust them to your preferences.