how to change default persian fonts in arch

I'm new at arch and have a big problem with it and it's Persian fonts are very ugly!

I inserted an image for example here

This is in all applications (chrome ,games ,gnome menu etc.).

What I can to do ?

Thanks for your attention.

Solution

open ~/.config/fontconfig/fonts.conf (create if not exist) copy this code and save > for change default font to Vazirmatn (persian font) :

 <?xml version='1.0'?>
<!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>
<fontconfig>

 <match>
  <edit mode="prepend" name="family">
   <string>Vazirmatn</string>
  </edit>
 </match>

 <dir>~/.local/share/fonts</dir>
 <dir>/usr/share/fonts/</dir>

</fontconfig>

Vazirmatn must copied to ~/.fonts before .