My advice was to sell other players also,maybe not all but the one that you really dont need and that can be easily replaced. If you do not expand your arena you will not be able to afford higher salary players, your earnings will be less than what it could be and you'll be stuck in this division next few seasons. If you somehow manage to win promotion, with this arena you will not benefit because your earnings will not be much higher and you will probably be relegated in your first season.