All products can be winning products if marketed the right way and you don't need to spend lots of money in trail and error approach to understand the marketing system.
It'll be better to get some help and invest in someone that has the skills required to market your products effectively and drive the right traffic to your store and to ultimately make sales.
I recently took a course on marketing and some important questions were asked in order to market a product effectively;
• Who the product is for? • Why are they buying the product? • Why are they buying the product from you (your store)? • And how they got to your store (your marketing strategy)?
The whole marketing process can be a bit difficult but it doesn't have to be, you can simply hire someone to do this for you. Which will be better than spending lots of money trying to understand the ads system yourself. It's both cost and time effective.
I left a link in the comment section below for those of you looking for pro marketers to help drive more traffic to your store
Cheers Friends God believe you all.