You can't speedrun trust. I've been building software tools for accountants and spent months just answering questions in bookkeeping forums before anyone even knew I made anything. No links, no mentions, just being useful. Eventually someone asks "what do you do?" and the conversation happens naturally.
The 5.3K views means the topic resonated. The zero sales means they didn't trust you yet. That's not fixable with better marketing copy - it's a relationship problem.
For your next project: pick one community, show up consistently for 3-6 months, share your actual process (failures included), and let people watch you figure things out. By launch time you won't need to convince strangers - you'll have 50 people who already know your work.
The Substack/email thing works but only if you're already interesting to someone. Cold signups don't convert either.