To me detachment means letting go of outcomes. I don't control the outcome so I shouldn't place my worth on the result. Doesn't mean stop caring, not trying, not having a plan, or giving up. I am solely in control of myself. If I do my best, I did all I could at the time then it has to be enough. I can learn from the experience and improve the process for future experiences.
How to practice detachment? Figure out the worst thing that could happen to you? (Spiers Doctrine - "The only hope you have is to accept the fact that you're already dead. The sooner you accept that, the sooner you'll be able to function as a soldier is supposed to function.") So the only thing that matters is are you doing the right thing. It easier to make a plan, take action and be brave when you aren't afraid of the outcome, you can't get hurt if you are already dead.
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712