I noticed you have 25 players on your team. The first thing you can do is cut your roster down to 11-13 players. Some of the worst players you have aren't worth selling, and can just be fired.
You also need to develop a training program. There are many directions you can go here, but I recommend picking either PG/SG, or C/PF, and finding 5 good trainees to rotate at those positions.