I would suggest that you cut your roster back to 12 or 13 for the bulk of the season. Use the money from the couple sales you make to increase your stadium, and use at least half of each tv revenue to increase your stadium. My stadium seats twice what yours does. I have only played two seasons, so it doesn't take too long to get a bigger stadium. Hopw about ticket prices? If you are selling out, raise your prices a little, especially for the most expensive seats. You can run a little test as well- charge 20 for your bleachers- see how many fans come, then see at what price a full house equals the same income from charging full ticket price. the next month change it to that price, and then increase your seats.
I am sure you can do it. Good luck.
Once I scored a basket that still makes me laugh.