The concept of optimal dosage can be applied to almost anything.
You need enough food to ensure you are nourished and satiated, but not so much that you become overweight and unhealthy.
You need to work hard and intelligently so that you can accomplish your goals and pay your bills, but not so hard that you deflate into burnout.
Even something like stress…You need enough stress to care about your own performance and results, but not so much that it debilitates or paralyzes you.
To enter a flow state, for example, you must be engaged in an activity which is challenging enough to keep you focused and not bored, but not too challenging to the point where you are overwhelmed or irritated.
It takes a while, and the levels are constantly changing, but figuring out your optimal dosage for activities you care about is an absolute game-changer.