How do I fund a project?
What you're asking for is not an obvious task to get completed.

The most recent, fairly successful, funding campaign that I'm aware of is for upgrading the Rules module to D8, via #d8rules. For some pointers about it, start from the community promotion ad (disclosure: I posted it) which looks like so:



Depending on what the subject of your project is, maybe your project also fits the criteria for starting a similar ad ... free of charge (just a relevant image and URL will get you going)!