Mindset is important. If you care about the craft of programming then you can easily get into a mindset that software must be "perfect", which is almost always impossible to achieve, and so you will become continually dissatisfied. I got into this mindset when I was a junior dev, and it only served to fuel frustration for me and others.

I try to take the mindset of "continuous crap reduction". I let go of the things that are out of my control, and seek to reduce the biggest problems that are in my control. Then I can get a "win" every day, and I don't try and fight the stuff out of my control which is only a little crap. I have to try and be principled without being opinionated.