I know injuries are part of this but seriously, why against competitve teams in a competitve game atomosphere.
I do not understand why you said this... It does not matter if you are playing a competitive team in a close match. injuries don't care. They happen. It would be silly to make it so that players cannot get injured during close matches against good teams don't you think? If you look at my roster right now you'll notice that my star 29k SG in injured for 2 weeks as well because i chose to play him in my cup game. Does it suck? Yes. Am I complaining about it? No, because i understand that it happens.
Also realize if you want your players to be injured less then look into a better doctor.
P.S. I don't think that your one injured player (Miho) from last season is completely responsible for you not promoting last season. After 5 seasons in D.V you should be able to win your league even with losing one good player, in my opinion.
Murray/Harris/MPJ/Grant/Jokic - 2020 NBA Champs