To maximize performance, avoid external dopamine sources for motivation and instead attach effort to an internal reward system.

“What's more beneficial in fact can serve as a tremendous amplifier on all endeavors that you engage in. Especially hard endeavors is to A, not start layering in other sources of dopamine in order to get to the starting line, not layering in other sources of dopamine in order to be able to continue, but rather to subjectively start to attach the feeling of friction and effort to an internally generated reward system.”