Currently You are Limited to X Listings. This will be Increased as You Complete More Sales.

An account on or eBay needs to complete a certain amount of sales to be capable of posting more than X (100, 500, etc) listings to Mercari.
"Currently you are limited to X (100, 500, etc) listings. This will be increased as you complete more sales." error is related to or eBay. You can get your limit increased when you make more sales on or eBay.