I agree with everyone here. Just keep training your 2 elite prospects as they grow into nice veterans. Keep one of your secondary ones to become a nice 6th man role player for your team.
Use 2.5M to upgrade your stadium right now, and you'll be near d3 level seats in no time. Saved the remaining cash later just to save it, because you never know maybe theres one nice player you see on the market.
3 Time NBBA Champion. Certified Trainer. Mentor. Have any questions? Feel free to shoot me a BB-Mail!