As a Solopreneur, How do you market your product?

I don't think you can. Not at scale anyways. But start small and build momentum as you go along building your product. At some point you can use paid ads. But you have to wait until they bring in more revenue than they cost.

I wrote up our approach here! https://digitalproductbasics.com...

At the initial stage, Just reaching to former colleagues. Also, creating video and sharing them. This is the one I shared today: https://youtu.be/COvVUp7pDpY

That's good question ,but i don't konw.