I deleted submissions but still says I'm out of space.

Please note that deleting the submissions will not reset the submission counter. 

You received 1 payment submission this month and that is the limit for the Free account. 

You can upgrade your account to enable your forms. More about different account types and limits you can find on our Pricing page.

If you don't want to upgrade you have to wait for the submission counter to reset, which will be on the first day of each month.