That's not the only problem here, when we stay with same company our salary and revision are less when compare to later hire. So money matters. Also new tech and knowledge are also lacking.
I was going to comment exactly this. Looking at this part:
> I could have improved the environment, the work, the team — myself. I write the conclusions down to be taken care of, reflecting on what I’ve learned.
From my personal experience, most people leave because it is almost impossible to get a significant raise internally versus changing jobs.
