I point out that equally good things could happen also. This requires skill. Asking indirectly allows the client to admit that, yes, they probably were partly to blame. One of my favorite tactics is to draw a bell-shaped curve on a piece of paper and then explain that things run in cycles. They have a beginning, a middle, and an end.
Jobs do too.
They start out exciting and challenging and then gradually begin to plateau. At some point, they take a downward turn and deteriorate. I ask my clients to plot themselves on this curve. Very often they point to the far end of the downhill side. That tells them something.