I started out as one of the first tech hires. Built a team (63 in tech now), processes and a lot of our products from nothing. I feel I am reaching the limits of what I can do here and growth (personal, technical) will be limited. I kinda sorta have an itch to go do something 'exciting' but wanted help in working through what my next career move should be: 
- Should I stick around? Is it a no-no to leave a company thats growing pretty fast? 
- If I should move out, what should my next career move be? Attempt to be CTO at larger company or a CTO at a smaller company (hands on, starting again)? 
Whats a good career move? I have thought a lot about this but unable to decide... Any help is welcome.