Starting with a subscription based product? How? I previously only built and sold plugins for game engines

I feel like I am stuck developing "one-time-payment" solutions for game engines aka plugins. Users buy them to add some functionality to their apps/games/etc.

This endeavor generates a few hundred $ per month in the best case scenario. I spend time helping users triage their issues and deliver new features.

Main issue I'm having is about distribution channels. There is no subscription based model in the marketplace where I published my plugins. It generates a nice organic traffic flow though! About 10 sales per month, each sale is ~ $25.

I recently realized that I can't really continue to do that long term. However, I absolutely like working on my products (even small ones).

I really want to start working on something bigger, avoid that marketplace in order to take control of everything I do (selling pipeline, marketing, updates, etc.). But I don't know where to start.

Any piece of advice from fellow 3D developers or folks who built 3D graphics related products before? Even if you have web-only 3D experience I will be glad to hear your thoughts.