When we go to the gym and lift weights, it increases our capacity to lift heavier weights.
In other words, the only way to get stronger is to slowly lift heavier weights.
Apply the same thinking to your life.
Do you want to increase your capacity to do more at work? Then slowly do more and more at work.
Want to increase your success? Then progressively do more and more difficult things that lead to success.
As soon as it feels easy, you need to push for more.