1-You have to put it in their self-interest, and explain it to them that way. What else can you do to make it in their own interest? 2-You have to demonstrate

1-You have to put it in their self-interest, and explain it to them that way. What else can you do to make it in their own interest? 2-You have to demonstrate social proof of your momentum. Show who has recently joined, and use that to show people are rallying around it. Everyone goes where everyone goes. 3-Set it up so it isn't clearly "your" solution so they de-risk being at the mercy of a competitor. Open source, but also run by a foundation, not just you.