You need one of two things: 1. A milestone that marks when you have done "enough" and can quit without feeling like you failed. 2. A metric that reinforces th

You need one of two things: 1. A milestone that marks when you have done "enough" and can quit without feeling like you failed. 2. A metric that reinforces the idea that "I need to keep doing this to avoid bad things or to get good things. When I stop, things I don't desire happen instead." Without one of those, you will tend to have some internal, subconscious thing go either "Yup, I've gotten what I needed and can't be bothered with this anymore." or "This is pointless drivel and doing nothing and wasting my time, and I can't be bothered with this anymore."