Ask HN: How To Market a Crypto Company?

https://BitBank.nz is a crypto live forecasting tool, we have a few customers (all from HN) and good conversion rate but just aren't getting the traffic.

Does anyone know any good ways of reaching out/marketing to people in the crypto community?

What I have tried: facebook/google ads: seems too expensive right now, no conversions from these sources yet.

Blogging/commenting, Quora, Reddit, producthunt style sites. Still our tiny traffic is 80% HN 20% everything else

We have a referral program where users can earn .003btc (~10% of a purchase) so there's money to be made if anyone knows how but it has been surprisingly not been used.

If there any large engaged crypto community somewhere someone knows how to reach out to?

Thanks! - Lee