Hello Anna
I would like to have more disc place
You do currently have ~300mb in the folder .trash (seen in root, the contents of that folder are safe to delete).
Further more you do have ~300 mb in backups on the account as well (under wp-contents), it is only one backup so I won't hold that against the requirements, however a backup is of best use kept offsite, i.e. downloaded to your local computer for instance as if something happens to the account you would otherwise risk losing your backup too.
With the .trash emptied you would not meet the requirement of using at least 75% of the available diskspace.