A lot of people change for good. Some people just fall off. Just trying to progress in anything, no matter what you're doing, I feel like any progression you make... some people aren't gonna be around you that were around you.
You have to have the service mentality in the sense that you subjugate your own ego, and you subjugate a large part of your own life to really helping other people, being successful on their behalf.
Having a child as a single mother was a crucible - maybe this is true for all parents. I got rid of so much stuff that didn't really matter in the scheme of things-like throwing stuff out of an airplane that kept me flying too low. What was left was essential, i.e. not a lot of extraneous stuff that had kept me busy and people-pleasing. I just didn't have the luxury of wasting my life force on so much stupidity and distraction. That made me strong.