Now that I've reached $1,000 MRR, my next big goal is to get 100 paying users in the next 100 days. Source: almost 2 years ago

If you're interested in joining the challenge the signup form and leaderboard are at https://100in100.co/. Source: almost 2 years ago

This month we're hosting a free group challenge for SaaS founders. The goal is simple: get 100 new paying users in 100 days. Source: almost 2 years ago

This last year we went from about 400 members to now over 2,000 (counting by active Slack members). A lot of the growth came from a challenge we ran called 100 users 100 days. The idea of the challenge was to get 100 new paying users in 100 days, with a leaderboard and weekly mastermind sessions for accountability. Definitely hope to run another round of the challenge soon. Source: over 2 years ago

- Try a public challenge like http://100in100.co. You'll get grouped with other entrepreneurs who are learning just like you. - Source: Hacker News / almost 3 years ago

Zero to Sold is worth a read. https://thebootstrappedfounder.com/zero-to-sold/. Source: over 2 years ago

I recommend to read the book Zero to Sold where he talk about the idea validation part, that should help you. Source: almost 3 years ago

Since then, Arvid has been sharing his learnings on his blog and with his Twitter audience that he grew from 400 to over 22.000. He wrote a book about the FeedbackPanda journey (Zero to Sold) and another one about the audience-building journey (The Embedded Entrepreneur). Source: about 3 years ago