There is no “dark energy”. There is no “mysterious” force, other than the natural forces of the universe which humans are just in the kindergarten stage of understanding, and which human math, assumptions and calculations still contain errors; errors which represent some distance yet between what we think we are sure about, and what actually is.
At some future date, the “dark energy” and other mysteries will be solved NOT by “finding” “dark energy” but by correcting our errors that led us to think there was “dark energy”.
Of course “correcting our errors” might involve replacing the seemingly ramshackle “standard model” with something more mathematically elegant. (However the “standard model” keeps chugging along withstanding all challenges!) This “correction” might involve a whole theory with explanations “new particles\forces” for dark energy & matter.