Deleting content including shared files does not free space.

Hey IrisLev​, let's jump right into this! 

Could you please navigate to your backups page and let me know if you have our feature enabled? You can always disable it in order to free up some storage space. 

Also, what does your plan tab report exactly in regards to your quota? Do you have any shared folders taking up space in your account? Provided this is the case, you can leave the shared folders that are pushing you over your quota using these steps. 

Having said all that, if you come across an issue, I'll be more than happy to help. Just give me a shout.

I'll be waiting for your updates