IIRC, John Denver unfortunately didn’t have enough altitude when fuel starvation left him likely trying to switch tanks, with a difficult to reach fuel selector valve.
The builder/pilot he bought the plane from put it out of the way intentionally. Practicing familiarity with operating that valve quickly possibly would have kept the engine from dying, and John as well.
Defying gravity is serious business. Approaching it like it is just a fun thing to do doesn’t seem like a very viable endeavor.
I gave up motorcycles because I recognized my limitations.