How to free up storage?

I have now only 90MB free. Can you please help me how to free up more storage?

Resetting or removing plugins is bad idea because I really need what I installed.

One of my idea - remove language packs and have only English. Is there any way to do this?

The language packages are so tiny, this won’t help.

Depending on you router 90 MB is totally fine.

I need to install Adguard Home and network storage.

Will this be fine?

Is there any way to install plugins on SD? Or maybe it is possible to remove unused packages from firmware?