Unable to add record even if I have cleared all the leads

Unable to add record even if I have cleared all the leads

Hi, I was using professional plan previously and have downgraded my account to free plan. I have purged all the leads, account and other data attempt to reset it to start from fresh. But I was unable to add new leads as the system keep showing that I have reach the limit and require to upgrade to professional plan. Appreciate for any help.