Right.It can be an intellectual/emotional morasse when the relationship is over to feel good enough to take up a solely internal chase for self-esteem.
For me it helps to do something else to augment the change or transformation I seek; a physical task or workout each day for at least a couple of hours.
First marriage ended, I had to figure out how I was going to live in my van now. Steep learning curve.
Second marriage ended, I went full-time into being the sole carer for my mum before she died of cancer. I'd never been able to get on with her. Challenging in so many ways!
Life made sure I definitely had something else to focus on!
I believe I've realised a lot more than I did after the first ended, but I suspect I may have thought something similar when I entered the second. There may not be a third. I'm certainly not feeling like there needs to be.