Thank you for coming to me for advice !
Well like your doing, advertising is very good step into more customers. One thing you might want to try is learning new things, it doesn't have to be very complicated something simple, like for an example team poses, i could teach you those, there very popular and if you want i could teach you anything else. Also, maybe if people work for you, more people visit the shop, like for me, i got PopPrincess_Lyra to join my shop for a bit and people noticed and started coming for my stuff and hers. You could also work for other shops and advertise yours there (if they let you) If you want i can advertise your shop at mine! Also you might want to format your shop like maybe putting spoilers for info (just my opinion you don't have to).