I feel Arno Stephanian is not convincing

I watched Cry Macho (2021) and Arno Stephanian was one of the parts I kept noticing. Many moments pass very fast, and I do not remember much after them. The role needs more detail, but the performance stays on the surface. For me, it does not feel very real in many scenes. 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. I remember both the good parts and the parts that did not work so well.