Thanks.
At this moment, the formation and starting players of my 2 teams are almost fixed. But I may change starter assignment if any starter poorly perform for some matches and show bad form is starting. Once new starter is assigned, they will continue to start until they play inconsistently.
Usually, in 1st half season, I need to rotate my players to compete different competitions. I also need time to observe whether new players as well as old players who are brought up from lower level can consistently play in this level. If my teams were eliminated in Cup and/or CL in later stage of season, I will select starter based on my earlier observations.