how to clean up "other" in storage?

Storage

• Other: Contains files that don’t fall into the categories listed here. This category primarily includes files and data used by the system, such as log files, caches, VM files, and other runtime system resources. Also included are temporary files, fonts, app support files, and plug-ins. You can't manage the contents of this category. The contents are managed by macOS, and the category varies in size depending on the current state of your Mac.

       https://support.apple.com/guide/system-information/see-available-storage-space-syspf9b375b9/11.0/mac/11.0

  Delete files

     https://support.apple.com/guide/system-information/find-and-delete-files-syspf5a64aa6/11.0/mac/11.0

   Optimize storage

Click the “Manage”button. Wait until Green “Completed” button appears.

    https://support.apple.com/guide/system-information/optimize-storage-space-sysp4ee93ca4/11.0/mac/11.0

You cannot manage it; the OS does (and it will fluctuate):

https://support.apple.com/en-gb/guide/system-information/syspf9b375b9/11.0/mac/11.0

You will have to clear out other things such as movies, videos, photos, etc.