If you find the right environment you can do both, but this is tricky and involves a bit of luck. In my current (underpaid, state university) job I leave every day at 3:30, don't check my email when I leave, spend much of my day at the office doing work for my side gigs (making my effective salary much higher), and in a couple years I'll be managing the department. Long ago I realized being sycophantic and a slave to others only made me a pathetic chump. But there's genuine hustle in there too, it's just for me, not them.