Continue expanding your arena.
Buy a couple of starters that you can afford, sell a couple of lower salary players to make room for them.
Continue to train.
Figure out which 3 or 4 teams in your division are the weakest so you know which teams you need to beat.
Target the games you think you can win, play TIE in the games that you aren't going to win (the top teams, tough road games).
Keep the gameshape of all your players high.
I think that you'll do just fine, you'll be surprised how many teams in D3 don't understand enthusiasm and gameshape.