I'm experiencing this right now with a career change from CivE to SE/SD.

Ever go through that 1AM thought exercise with your friends where someone ask the question "If you can turn back time and relive everything from one point in your life with all the knowledge and wisdom you gained so far, what you do differently and how do you think it'll play out?"

Yah it's like that. Just playing out IRL. It's been awesome so far. You are somewhat starting from square one, things are different yet familiar. You're gaining new experience but know to avoid some of the common pitfalls and traps, and know when, where, and how to apply your strengths.