Good work! It's a great question really, and when honed can come across as very slick, of course one needs to be able to back it up but it has always seemed to work well and is one I coach people into asking.
New job horizons can keep a person motivated and moving forward, energised as such, and to be honest it's time I did the same. Like you I have job security but for me there's no really satisfaction. The job yes, the environment no.
Good luck.