Seek for informations about shopify theme

Hello everyone, it's been a while that I look all of the topic of this forum in the shadow.

I already tested dropshipping but can't get any sales , I'm a web developper so I want to uses my skills, anyone already made a shopify theme and sold it on themesforest ?

I saw there are a ton of competitor but i need to know if there are already some success story in this here, bye