You do currently not meet the requirement as you are not using more then 50% of the allotted diskspace. You are welcome to ask again once you meet all the requirements.
- You need to be using at least 50% of your disk space;
- Your account needs to be in good standing (no current suspension);
- You need to have a valid website that follows our Terms of Service; and,
- Your account needs to be at least 7 days old.
The majority of the space your site currently uses are from an sql file in "oxwall/ow_userfiles/plugins/antispammer/23_10_2013" (file in itself is nearly 200 mb), seem to me that it most likely is some kind of backup file (database). Keep in mind that storing too many backups on your account could be viewed as using the account as filehosting, which is prohibited in ToS.