How to fix this issue in iphone?

Hey guys i have iphone 6s i'm getting this message storage almost full its so f_____ irritating cuz i already did a backup and restore about few weeks ago.
So if it is recommended to backup and restore again then how to avoid getting this message or in other words how to avoid getting (others data).

Delete apps or music

Delete things that are taking up space on your phone: text messages also take up space. Delete apps you don't use, music you don't listen to, photos/videos you've transferred to your computer, etc

Get rid of some files.