Essence of Perfection
By consuming this Essence, the quintessential distillation of success, you become pretty much perfect.
* At the time you consume this Essence you immediately win the genetic lottery. Your stats all increase to peak racial maximum, you are restored to perfect physical and mental health, and your age reverts to the prime of life.
* You also gain the typical action-hero package of a minor healing factor that allows action-hero level recovery from injuries, immunity to all diseases, and a one-time boost to your desired appearance.
* You gain infinite willpower to keep going through any amount of hardship, and a perfect memory with infinite storage.
* You gain ideal harmony of thought and action. You simply do not fail at anything you attempt so long as you had a non-zero probability of success in the first place. Your talents, skills, abilities, instincts, and luck will all come together in a perfectly subtle and harmonious whole to guarantee absolute peak performance every time. Note that this is not omnipotence - if you had simply no possibility of succeeding, then you will still fail. To use a tabletop RPG analogy, any time you would normally roll dice then you would auto-crit or max-damage instead but you're still capped by what would otherwise be your stats and abilities.
* Since your talents and instincts and capacity to learn are as perfect as the rest of you, you can train up new skills and master new abilities stupidly quickly and your skills, stats, and abilities never degrade unless you wish them to. Even if learning a new ability would normally require you to forfeit progress in a prior one, you can ignore that and just continue learning all the same.
* If you wish you may 'dial down' your perfection so that you only achieve normal successes instead of critical successes, or even undergo the normal risks of failing (or at least as much risk of failure as a person with your skills and stats would normally have if rolling honest dice). You may do this selectively for each individual action and without having to pay conscious attention. Perfection is not really perfection if it's a trap, and this is not a trap. There is only one exception to this.
* That exception is actions necessary to save your life. So long as there is any possibility you can survive a situation, you will. Your skills, instincts, and luck will carry you through any such encounter still alive, if not necessarily victorious. Although actually losing would require facing odds so overwhelming that even your absolutely perfect skills and performance still couldn't hope to overmatch them.
* On top of this you gain impenetrable plot armor oriented towards always giving you a chance to continue living. You will never face a situation that has absolutely zero chance of survival, and narrative causality will always twist just enough to explain why your body wasn't found, or your enemy chose to capture you instead of kill you, or how you survived an otherwise lethal wound, or how your crippling injuries were eventually healed, or suchlike. You can still suffer setbacks but you will always have a chance to recover and resume living your life the way you wish to.
* If you by some impossible mischance manage to overcome all of the above protections and get yourself killed anyway, you will return a while later with some kind of vague retcon for why that dead person wasn't really you or wasn't really dead.
* Even if you would normally age, you won't. You will remain in the prime of life for as long as you choose to. Narrative causality will guide you to an in-setting explanation for this if you wish, or simply have it be a thing that happens 'just because', or constantly retcon your birth date. Nobody will find that odd unless you wish them to.
* These anti-death protections can also be extended to those you deeply care for, your 'supporting cast' as it were, to a somewhat lesser extent than they protect you. Its not a perfect life if you're always alone.
* When you are finally ready to stop living and move on to what comes next, you will. This will only happen if you wish to do so while entirely in your right mind and with the utmost sincerity.