If I downgrade will the submissions get deleted?

When you downgrade your subscription, your forms will not be deleted. However,if you reach your total submission limit the system will automatically delete the old submissions to pave way to new submissions.

For more information regarding limits, you may check this guide:https://www.jotform.com/help/408-Understanding-Your-Account-Usage-and-Limits

You may also download your submissions.

Guide:https://www.jotform.com/help/73-How-to-Download-Form-Submissions-as-Excel-CSV-PDF

Hope this information helps.