Otherwise, I think you need to find the right combination of good leadership and good application. Right now I'm working on autonomous vehicles at a startup, and the application is interesting and definitely "wild west" where you are breaking ground and trying new things to get to the goal, but on the other hand the leadership is dropping the ball on hiring, trajectory, goals, etc. So it feels like a mess in terms of what and why we are working on the things we are doing. Often back tracking or throwing away work because the leadership didn't think their plans through. So I think finding something that has both great application and great leadership, involves finding a field you think is kick-ass, cutting edge, and meaningful, and then looking for leadership that has a great track record.