Looking for advice on getting the ball rolling properly

Hi. I recently started selling our products on Amazon after a very long-winded journey of Brand Registry and ASIN registration. We’ve sold a few units both with sponsored product ads and organically. The ads were performing daily well for a couple of weeks and it was starting to look like paid ads could be done daily cost effectively, now all of a sudden it’s become a cash furnace with no sales! Why? Also, organic sales seem to be very hard to get too. Does anyone have any good tips to get the ball rolling properly without it costing and arm and a leg?