You may create up to nine (9) carousels in your "Carousels" tab, but only three (3) product carousels may be published to your publisher profile page at a time.
You may swap out certain carousels for different seasonal or themed titles (e.g. Holiday/Christmas) and leave up New Releases and/or Best Sellers year-round. Or customize the order of your three Carousels as you wish!