Hey,

One good case study is Maybe Finance. It was a dead project. They open sourced it. And it went viral. And they raised $1.5m within another few weeks. The virality was on GitHub stars and Twitter.

I run a channel about open source that may give you ideas of what other COSS projects are doing: https://youtube.com/elie2222

My COSS is called Inbox Zero: https://getinboxzero.com.