I recently shutdown my open source project (respondcms.com). I spent over 5 years building it and was able to scrape some revenue out of support contracts, ins

I recently shutdown my open source project (respondcms.com). I spent over 5 years building it and was able to scrape some revenue out of support contracts, installations, and theme sales (~$100-300 /month). But, I never got to the point where it was sustainable. I do think that it helped me a lot in my 9-5 job as I was constantly solving problems and developing new skills. It also gave me a unique skillset that I used to development a new product called Profit Pages (https://profitpages.io/ https://profitpages.io/). In terms of tips to turn it into a full-time career, I would recommend (1) open source libraries, not complete products, (2) keep it small and sell the parts that make it complicated, (3) do not sell customizations (anything that does not scale past 1 person), (4) have a revenue plan from day one.