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I took a look at your account and all forms within it and non seems to be over quota. I presume that you had a form limit set on one of the forms, but have removed it after posting your question.
I do however see that you have posted another question here: https://www.jotform.com/answers/808416 with more details.
I have inspected the links on the other thread, and all of the forms there seem to be working properly as well.
Now I see that you have upgraded, but based on your current usage you are OK for the free plan as well. If you happen to get the same error message again, please do let us know.