How can I delete some storage in my other

It could be that many GB of Other is genuine data generated by apps.

But if you think it is junk then the only way to reduce it (if you already upgraded beyond 13.6.1) is to

Backup and restore (I recommend the computer method if you have one)

(1)How to back up your iPhone, iPad, and iPod touch – Apple Support

Unlock your SIM PIN if it has one

(2) Restore your iPhone, iPad, or iPod to factory settings – Apple Support

(3) Restore your iPhone, iPad, or iPod touch from a backup

 Don’t miss out (2)

See if this helps: https://support.apple.com/en-us/HT211686