This is a group of suggestions from me and a few other people.
1. The ability to upgrade your stadium by more than 1 for example upgrading from level 10 to level 15
2. The ability to upgrade your players in bulk such as giving your player 5 upgrades at once or your whole team 2 upgrades at once.
3. Have a mode for your team to only play one that is within for example 10 points of your team
4. Make baseball generate more money
5. Make the ranges higher for how much you will get from upgrading your player for example changing 20k witch is 1/3 to 2/5
6. Have winning baseball games increase your approval rating and if you lose very often have it decrease
These our my suggestions I am open to taking feedback on them.