Right division IV is a dodle and you should win it in your first full season easily.
If you are interested I will look at your team and your roster and be more specific but here is the general plan.
1) Get three good low fouling trainees all suitable for the same position. Age 18-20 max and best done early next season.
2) Get two solid players for the opposite positions. Age 28-31 and best done now.
3) Keep staff minimal, level 4 trainer is ideal but you don't need more than level 1 until you have trainees.
4) Spend some money on your arena. A 4 luxury boxes, 50 courtside seats and 500 bleachers is a good start.
The aim should be to win next season and have three stud trainees making great progress while doing it. A little day trading as you have already done is a great way to suppliment your income while in division IV.