Peter Drucker's my guiding light and his wisdom always inspires me to think differently than my default setting.

In addition to the list that you have provided, I want to add this question that we should ask ourselves before making a career change - why do I want to change my career and how will the new path align with where I see myself?

Sometimes we wish to change our career with a delusion that it will make things better, while the problem and solution lies elsewhere.

Starting with this question can guide us towards the change we wish to become.