I had built a product https://brainturk.com brain training games. It was my first product I built on my own. There was some traction but I was not able to scale it up. I have stopped working on it for a few years now and it is running in auto-pilot mode. It gets decent traffic (around 50K users this year mostly from US). I am looking for someone who might be able to use it. I am working on a different product now so will not be able to put in my time, if you have a plan and resources to take this forward let us connect and chat.
@mk I don't know this is not what you are looking for. But I thought to give it a shot to check if you are open it.
Here it is - I run www.tractionmate.com and work with developers and early startup founders to build early traction. And, I also run another productized service to build an email list using lead magnets and a few other tactics. It's @ https://www.listbuildify.com
Let me know if you want to talk more about these lines.