Remove cleanmymac Only As Per Developers Instructions. This Cra*ware will really mess up the OS and may even corrupt it to the point it needs to reinstalled.
Get an External USB Drive and move Documents, Videos, Pictures, Movies, iOS Backups, Music off the Internal Drive to the External Drive
As for The Other Category should not be altered, modified, move or deleted nor should it be attempted to be. Doing so may corrupt the OS and rendered the OS inoperative requiring a Wipe and Re-Installation.
The Other category is a potpourri of files which include:
• System temporary files
• macOS system folders
• Archives and disk images (.zip, .iso, etc. - often found in the Downloads folder)
• Personal user data
• Files from the user’s library (Application Support, iCloud files, screensavers, etc.)
• Cache files
• Fonts, plugins, extensions
• Other files that are not recognized by a Spotlight search
• Media files that cannot be classified by Spotlight as a media file because they are located inside of a package