You need to work on building up your bench. YOu have 4 good pieces. 4 on 5 will never win. Its okay to do 4 on 5, if your actively training, but it doesn't look to be the case. Plus, once those 4 get tired, your bench is easy prey for the opponent.
Your arena is nice. I'd buy 2 young Allstar+ potential 18yos with atleast Average ID and OD, and build them up, then add 2 or 3 33 YO's that have some actual skills to help fill out your roster, on the cheap.