Do not ignore the marketing and (especially) sales part. You're going to be running a business and just the fact that your software is genuinely useful and popular will not bring in the money.

Don't shy away from pitching companies you see using your tools to pay (note it's a sales pitch: a "here's actual value you get for your spend", not "support us, it's the moral thing to do")

Thanks for working on open source and good luck with this!