Taking pride in your work is a good thing. However, consider that it's all relative... your 50% effort is probably another person's 100% effort. You are totally allowed to dial it back and focus more on yourself and your family. In fact most people probably would not even notice if you did so.

The first few years of my career, I worked as hard as possible and started feeling deeply ill. I realized the need to put forth my maximum effort was all self-imposed, totally in my head. Now I personally try to do as little work as possible, and I am still highly regarded at my job.