I think he did an excellent job portraying a man who was tired but still lethal. He was in a hard position. The man he killed on consecrated ground deserved death and John was tired of messing around with him. Kind of like Thor and Thanos in the end game.
John Freakin' Wick
But now John has to figure out how to survive the hoard of low level and high-level assassins trying to kill him. His allies are few and fleeting. He can only trust them when he can see them.