I was HVAC tech and deeply involved in racing at a professional level.
I had a very active shop as well.
I would not change much except maybe finding more time for them.
We camped/boated etc but just hanging out and reading to them when they were very young. Watching their favorite movies and such. Personal touches.
I have done much in recent years to atone for my absence. Time missed.
Life seems to be nothing more than an accumulation of regrets.