550 Can't create directory: Disk quota exceeded

Hello Admin,
Before raising this ticket, I have gone through similar topics, but none of them helps me.

My account statistics are as follow :
Disk Space Used: 5228 MB
Inodes Used : 12 % (3595 of 30019)

Though my inodes usage hasn’t hit the limit, I’m facing ‘550 Can’t create directory: Disk quota exceeded’ error while transferring the files over FTP.

Your disk usage was restricted because file/media storage/sharing activity was detected on your account. Because of this, a disk usage quota was installed on your account. Please remove any file/media storing/sharing content from your account and don’t upload more content like that. That way, you’ll create space which you can use to upload normal website content.