Suggestions for next steps in career

Hoping to get some tips / recommendations on what actions I should take next Background: I've been at MS for about 15 years now. I came in at L59 and now at L65 as an IC PM. I've got a clear path to lead position and enough scope to grow to L66 and beyond. The team I'm on and projects I'm helping drive are incredibly satisfying to me technically. I work with a ton of smart people and am happy to say I'm (usually) the least smart person in the room - a hallmark of a great learning environment. As of recent couple years, I've had a desire to work in another company. Another cloud based company where I can really excel and learn a ton (Google, FB, Amazon, etc...). But I'm worried it's for the wrong reasons (e.g. money or prestige) given where I'm at in my career and my path. In addition, I do have a family in the Seattle area with 2 kids. So WLB is quite important to me and I understand that at a certain point, to continue upward trajectory in a new company you need to put in hours and hours while you prove yourself . My question for all of you is if I should hang out at MS, get to L66, start earning some real cash AND get the M1 training or if i should consider jumping to another company knowing well that I'll lose the bulk of my network or hold out perhaps until I reach M1 or L66 even before moving? I just worry that there will never be a good time to leave... but again, I don't want to leave for the wrong reasons also. Advice would be awesome!