where do you promote your products?
This is a big secret, no one can tell.
Actually, promoting your items depends on many things such as SEO, social media, build an email list via giving freebies items. The big pack products can be promoted via facebook ads, google ads but you have to keep in mind regular items are not good to be promoted via Facebook ads nither Google ads.
This article is really helpful, building your email list is the most successful way to get an increase in sales.