I have been pretty lucky in the jobs area. I have had some physical problems in the last few years. But that is just life.
If there was two things I could do different this is what I would do different.

First I would take better care of my health at an earlier age.

Second I would save 15 cents of every dollar I ever made.

Al my working life I saved 10 cents of every dollar I ever made. And that alowed me to retire at the age of 40. If I would have saved 15 cents of every dollar I ever made then I could have probably worked 4 or 5 less years.

If I could sneak in a third then I would have relied even more on what a good boss of mine told me once a long time ago. "Don't work hard in life, work smart". Tom.