If you can feel it, it's because it fluctuates.
Whether it's hunger, motivation or happiness, your brain is wired to detect the rises and falls. A quantity that never changed would be invisible to our senses.
So by definition, it is impossible to stabilize the important aspects of life.
Precisely because what makes them important is their variation.
Looking for the one action that would make you happy forever is as absurd as looking for the one meal that would satisfy your hunger for good.
Highs are inseparable from lows. There is no light without shadow, no right without left, no order without chaos. Each only exists as the opposite of the other – what Eastern traditions call non-duality.
It's not a battle either. Because if it were, then one side could win.
Can you picture a world made only of light? A space made only of up? A life made only of joy?
The trough of the wave is not a flaw in the wave.
It's its nature.