Similar approach and story to myself, in that I started a side project for my own use and interest, and then released it to great feedback as a side hustle, went part-time and over the last 2.5 years managed to go full time.
I've yet to reach your $1M ARR though.. but hopefully getting there one day!
Recently wrote up a Year in Review which touches on similar learnings as you've written over the last year:
https://www.magiclasso.co/insights/ad-blocker-year-in-review...
Have also had a keen interest in FIRE over the years and hadn't heard of your product... personally I've just kept my own spreadsheet which runs through scenarios, progress etc.