What does it meant that I am out of subscription payment limit?

That means you can no longer accept payments on forms that have a payment integration in it. For example, you're using Authorize.net. Your regular forms or forms without the payment integration will still work.

We've introduced this new limit a few weeks before May 1st. The Bronze plan, your current plan, is limited to 10 payments per month only. If you need more, you will have to upgrade your account. 

You can check the limits in our pricing page here: https://www.jotform.com/pricing. For example, Silver Plan allows you to receive up to 100 payments per month.