Herman Martinus: How I stay motivated as a solo-creator:

When you're working solo, however, there isn't a specific thing you have to do. No pre-set route to take. If I decide to not do any work today, no-one will notice. But if I continue doing so for too many days things start falling apart. Slowly at first, then rapidly, until everything I've built comes toppling down around me.

What Martinus describes in his post isn't too far off from my day to day routine.