Typically, the reason would be that your insertions for the month exceeded the 1,000 free insertions allocated to a "Basic store". What does your Seller Hub Overview page report for insertions this month?
You currently have 744 active listings. If you sold (or ended) over 256 items within this billing month and replaced some with new listings, they would exceed the 1000 allocation for the month. If any of those listings were posted in more than one category, each category would count, as an insertion.
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