Fresh out of school diploma holders probably get $2,300 tops. I would say with your "years" of relevant experience, you would be very lucky to get $3,500, unless you got a damn solid track record and a portfolio of past accounts and clients to back up your ability.

Your correspondence degree, unless issued by a high-ranking university, is probably worth f***-all. You're probably better off staying in your current $5,000 job.