I just want to suspend my account until we need it for the next event in 2018.

I can see you have an active subscription on PayPal, please cancel your subscription since it is auto renewed, this way you avoid to get billed: https://www.jotform.com/help/336-How-Can-I-Cancel-My-PayPal-Subscription 

Once your subscription is cancelled you may keep your account on free status and active, you are free to come back to your account and upgrade if needed.