First see my last posting .. nvidia-settings might have what you need .. if not, see below
If 1920 x 1080 fits the screen, you could try changing the DPI setting to make the fonts larger
Create a file in your home folder called .Xresources
and make it read:
SAVE the file.
Log off/on to test.
Changing the number 125 should change the font size .. (96 is default).
Deleting that file and logging off/on will bring you back to defaults.
If this is Peppermint, you can change the icon size in File Manager > Edit > Preferences > Display
and panel size by right-clicking the panel, selecting Panel Settings > Geometry > Size