Sqlite is a database engine used in small projects because it is easy to manage (No import exports, just upload the file and you are done). Though mysql is recommended for bigger projects because it is faster and feature rich than sqlite.
If your sqlite database is bigger than 10 megabytes, you cannot use it in infinityfree. If you want to still use sqlite database, and not switch to mysql, you can try compressing it.
Just execute the following
SQLite command and you database will be compressed!:
To enable auto-vacuum:
If still your database is bigger than
10MB, you should consider about switching to mysql.