Hello all, I will be explaining how to add more fonts to the ones we have on our infinix devices. First things first, make sure your phone has xtheme where u can download fonts from. 
Now to start, download Hi-font from google playstore, after installing open the app and select any type of theme you want, it will be downloaded to your phone's internal storage under the file "font", copy the font and paste in the latin file inside the lovely fonts files, go to settings, display, font style you can now go ahead and change your font style to your taste.

Also you can download from other sources and install to your phone, just make sure these sources are virus free, hope I was able to help someone with this tip.