I sell a self-hosted web analytics platform[0] and earned around $15k this year. Not really passive as I quit my job to work on it (mostly updates so far), so I

I sell a self-hosted web analytics platform[0] and earned around $15k this year. Not really passive as I quit my job to work on it (mostly updates so far), so I hope that with some marketing in 2021 I will at least 10x that number. [0]: https://www.usertrack.net https://www.usertrack.net