I feel Michal Čech is not convincing

For me, Michal Čech's work in Idiot (2022) is easy to talk about after watching. Some emotions are too simple, and I cannot believe the character enough. I do not hate it, but it did not pull me into the story. The role needs more detail, but the performance stays on the surface. For me, it does not feel very real in many scenes. I remember both the good parts and the parts that did not work so well.