In one word: Marketing
Modern marketing is not trivial. You need to leverage:
Technical / On-Page SEO (so this very article has all the schema.org markups, social meta data, meta descriptions, title tags, etc…);
Digital PR / Link Acquisition (get lots of authoritative blockchain and Q&A oriented websites to link to this website);
Social Media Marketing / Influencer Marketing (build lots of outreach lists and asking influencers to join and share the site ongoing)
Targeted PPC ads (create ads on Adwords, Instagram, Twitter and display networks to bring people here)
Content Strategy & Marketing (produce regular high value content that brings people here)
User Experience (make on-boarding as easy as any modern / incumbent app using a phone # or OAuth API)
All of these require you to understand your audience to be effective, so I would advise downloading this spreadsheet:
…and filling out the Persona portion in particular (to get a better understanding of your users are, what they value, etc…).
If your team genuinely tries to do each of these things in contextual and relevant ways to your brand and audience, you will see a major uptick in overall users.