Unfortunately this did not work for me. I tried creating a .Xresources file with Xft.dpi: 192 in /etc/skel and in /home/user in my fedora template. I also tried editing the dpi in /etc/X11/Xresources in the fedora template. The text is very small. Please let me know if I am missing something obvious.
edit: I removed gnome-settings-daemon and text is appearing larger now. 4k font size dom0 vs vm - #10 by Sven