Ultimately this whole issue of "what action to perform for deepest satisfaction" comes down to the brain's reward system. Actually tangentially related to ML.
I am in the process of withdrawing from opiates that were prescribed for an injury. Over time I realized that my wear-withall to do hard and long term rewarding tasks was being degraded by the opiates. I still have pain but narcotics training my brains' reward system are so much worse than pain can be.
We all have seen movies and have that visceral image of the executive or city slicker who does hard drugs but still has drive to take care of their family, pay the bills, and do the hard things -- as if they lived in two worlds and were somehow hardened against mixing the pleasure rewards of drugs and the real rewards of life. Well it is pure bullshit. For only one reason if any: the brain physically changes..no matter how tough mentally a person is.
Ultimately, if one doesn't reinforce medium length promises of rewards and doesn't de-emphasize short term rewards like Netflix, drugs, and other consumables..then the brain has much larger of a reward gradient to scale..a steep cliff that is likely to require mental reserves that are likely to be exhausted, failing to push through. The only way to do long and hard tasks that have worthwhile rewards is to...train for them..by consistently going against the empty vapid consumption culture. It is just dopaminergic biology. Don't get used to easy and hollow pleasures. Because though day to day pleasure might be dictated by simple chemical concentrations of catecholamines, happiness is a complex thought..a function of memory and past effort... nothing easy gives real happiness. Only pleasure. And cheap pleasure is something we end up becoming stale and miserable over, wishing we hadn't reinforced our weakness to fleeting and short term, short sighted, moments of incredulity.
Happiness comes from knowing we did the hard things that went against our feeble reptilian neurological reward system. That we truly defeated easy and thoughtless inclination.
https://www.smbc-comics.com/comic/best-life-advice