Why I cannot accept payments on my form anymore?

We are a small group of 175 golfers who can no longer accept 2017 applications

I have checked your account and I can see you're already exceeded your payments limit, as you're a using a free account you're only allowed to receive 10 payments. 

I would suggest you to upgrade your account to the next level so you can remove  the 10 payments limit of the free account and you will be able to receive the same number of payments as submissions.

https://www.jotform.com/pricing 

Otherwise you would need to wait until the first day of the next month to get the counter reset.