I think that 'other' is referred to the apps that is pre installed in your phone or the system apps. If you want to clean them you may try to read this article I have for you https://www.syncios.com/android/clean-up-android-devices-and-other-storage.html and try cleaning it by yourself. If you are afraid to do that then seek an expert for you to help. 😊
It can also be files that are associated with the apps you install Normally called system files. try to install google file to analyze the storage and it will help you delete temporary files and junk files.
