I suppose what I was getting at is that you will have to ask yourself a few questions?
1. Are you willing to move to a larger area?
2. How busy do you stay freelancing?
3. Are you charging enough per hour?
4. Do you have contracts with clients or just 1-time customers?
No offense at all, but 25 years of experience in what you do should tell you some things.
Again, no offense questions to ask youself?
1. Do you suck at what you do? My guess is no.
2. Do you only want to work 15 hours a week? My guess is no.
3. Do you market yourself? My guess is no.
4. Are you charging enough? My guess is no.
All you are really needing to gross $6000 is 30 billable hours at $50 per hour.