Because Sony does not support font changes natively, you must source these files from community repositories. Only look for .vpk or .supd files.
for Vita3K to find mirrored links when the main servers are down. Article: Mastering PS Vita Customization with System Fonts download font package psvita top
For a safe and efficient experience, the following tools and methods are the community standards: fontInstaller (GitHub) Because Sony does not support font changes natively,