My account have 1000 submissions limit, but why it is showing 100 only?

You are currently on the Storage plan, which means that your account can have up to 100 form submissions each month.

The limits of the Storage plan are the same as the free plan, with the exception being the total amount of submissions your account can store at any given time. With a free plan, your account can only have up to 500 submissions at any given time, while with the Storage plan the amount of submissions that can be stored in your forms is not limited.

The limits of the Storage plan are these:

->Receiving up to 100 form submissions each month.

->Receiving up to 10 payment submissions each month.

->Having up to 1.000 form views each month.

->Having up to 100 MB of uploaded files.

->Total number of submissions stored in your account is unlimited.

->Having up to 5 active forms.

Your account is currently in overlimit status because it already went over the 100 form submission limit for this month (it has 146/100).