I don't know if this is me, but I find it easier to "slack off" as I get more successful with my side projects. With fixed projects/working for/with someone else, I get this sense of accountability and it's very easy for me to stay on track.
Is anyone else finding the same thing for themselves? If so, how did/do you solve it? How do you keep the same pace as you get more successful?
I think this is an universal thing. Having a bunch of money at your disposal can create an urge to finally start 'enjoying' them vs. continuing to work hard as if you never got them in the first place.