50k is definitely achievable but I wouldn't expect it overnight. Most people are using their "sweet spot" and turning that into a coaching or consulting business. You can surely do this and charge clients upwards of $600-$1200 or more per month residual income on contract for a 6-12 month program. It all depends on you and what problem you can solve, Getting into a niche you don't know much about will take you some time to learn and then you'll have to figure out what you can solve for clients that the next person can't. You can always do some research on niches with low competition but I would suggest working with what you know first, to get money flowing in, and then learning something different later on if that's what you choose to do.