Your teams biggest problem is your game shape dude. Your best three players all have inept game shape which means even though your 8k player has decent skills he is only playing like a 3-4k player. Same thing for the other two players. You have to learn to try to get all your players between 48-65 minutes per week, this way their game shape will go up instead of down and they will perform better. This is why my 50k center is playing like a 60k center because he has proficient game shape. As do almost all of my players. That is how you become a successful team.
Murray/Harris/MPJ/Grant/Jokic - 2020 NBA Champs