can i suspend my billing until i need to use again and keep my forms?

Hi,

You can cancel monthly subscriptions at any time with no affect on your forms or data.  As long as you are below the limits for a Free account, which you are currently well under, you can downgrade back to a Free account until you need the upgrade limits once again.  There is not penalty for doing so.

thanks. the limit is 10 per month for free? would I be notified if I went over?

The limit for payment submission is 10 per month for Free accounts.  You will be notified when you are close to that limit and will have a day or two to upgrade prior to your forms being disabled.  Even if your form do end up getting disabled for being over limit, upgrading will immediately restore them.