JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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You can't reset your submission quota on your account. Your account submission quota resets on beginning of every month. Number of monthly submissions is based on your pricing plan.
In the future, you can limit number of submissions on your form by going in form builder and clicking on preferences.
In form Preferences click on Form Limits and then click on Submission limit.
Set the field to the limit you want and form submissions will be limited to the value you entered in Submission Limit field.
Please let me know if this works for you.