Never stop writing code
No matter how your role evolves, try to never stop coding (or if you cannot code, get involved in code reviews). You don’t necessarily need to be writing code that is on the critical path of your team (in fact, you probably shouldn’t) and you don’t have to be coding quarter after quarter, but you should try to do some coding on a regular basis.
Work life balance
Much has been written about finding work life balance. My 2 cents are simple. You do not reach balance by reducing work. You reach balance by finding a passion that draws you out of work. Of course, family comes first on this ladder, but we often need some other passion. In my case, I had the most wonderful experience writing a book about coffee. I did not plan it as a worklife balance treatment, I just realized it in hindsight. With the exception of spending time with my kids, I found that the evenings spent researching and writing about coffee (let alone the exotic trips I had to take as part of this learning) gave me hours of respite without thinking about work.