You're really short on cash, right ?
I wouldn't sell him now. Try your luck since you're there. If you win your 2 remaining games, you can finish 3rd, Cloporte will have a difficult game against Biokimikos.
If you end up 3rd, you can win the conf semis against the odds. The conf final will be a real challenge though. The more games you win, the more money you get.
If you can't win promotion, you'll need to sell your C or one young player with potential, it's your choice really, either way you'll have to buy at least one or two players . You can't rely on the draft too much.
If you choose to keep your C, you will still have a high wage player and it will be difficult to manage.
You need to build up your arena to develop your team and sustain higher wages, it should be a priority of yours from now on and you need to make a benefit for the investment.