50-100K is more than enough to support you for a year. That means you need to start making $4200 a month by then. You'll know if this is doable by month 6 at the latest. If it doesn't look good, pack it up and find a new/return to the old job.

You're in a really good position, and for some reason you seem to be waiting for something...I'm not sure what.

Get out there and build it.