One of your guys is selling for $500000 this week, that will definitely help.
I think you might be better off sticking around with the team you've got. Perhaps tank next year, train a couple of 18 year olds, save all the $$$$ you can and then demote to D5 the following season. That way you'll be in the exact same position you would be waiting 7 weeks, that being in D5. Only in this case you'll have a better arena and more $$$$ in your pocket and a couple of decent trainees in your hand.