Storage

The "other" category is basically anything that doesn't fall under another category in regards to storage. It's usually cache, trash, history, "other" users, browser cookies, system logs, document versions, and application cache, and much more...

You can never get "other" storage completely gone but you can get it down considerably.

Try clearing your cache:

To manually clear cache files on Mac:

1. Navigate to Go > Go To Folder.
2. Type in ~/Library/Caches and click Go.
3. Click-hold Option and drag the Caches folder to your desktop as a backup in case something goes wrong.
4. Select all the files in the Caches folder.
5. Drag them to the Trash.
6. Empty Trash.

Follow the same steps for /Library/Caches (without the “~”) and 

~/Library/Logs. 

Find where a majority of apps’ temporary files are by navigate to ~/Library/Application Support. In this folder, you will find your applications, and some searching will reveal a lot of space being taken up. For example, you may have several GBs of old iOS backups in:

~/Library/Application Support/MobileSync/Backup

Check the dates on these mobile backups. If these aren't recent you can delete them.

Search for unneeded .zip and .dmg files:

1. Open Finder.
2. Type DMG/ZIP in the search field.
3. Select Search: This Mac.
4. Sort the results by Size.
5. delete

Also... review this article: Free up storage space on your Mac - Apple Support

Good Luck!!!