Ask HN: How are you acquiring your first hundred users?

I am building a B2C AI SaaS with $50/month price. How would you go about getting with first 100 users and then the next 500 users.

What we are currently doing: 1) Cold outreach to power users - to convert them into affiliates. 2) Cold outreach to individuals who have target ICP communities. 3) SEO for more long term (not for the first 500)