Training for alpine climbing

Today I belayed someone who is a living legend in the climbing community, and it was fully eye opening. The three routes that they did allowed me to see that I had not actually reached a plateau in my training, I just was not trying hard enough, plain and simple. I was not climbing through where I thought I "should" fail. It is in this period of struggling that one's biggest gains are made. Before I left the ground I had basically decided that I would fail at a certain point. I received some great belaying and managed to push through the crux on my current project, I didn't finish it, but that is just an endurance issue, easy to deal with. I can handle more training, just not more training that is not benefiting me.