Feeling satisfied with being better than most

I’ve been contemplating these ideas for several weeks, and this is the first occasion I’m writing about them. Recent objectives I’ve established and experiences in my life have led me to recognize a recurring issue: whenever I achieve a level above average in any area—even if it’s just marginally—I frequently fall into stagnation and complacency.

Although I keep reminding myself of my intense passion to excel in this area or hobby, once I reach a point of being clearly above average, I usually start to lose interest. I can hardly believe the numerous examples that have come to my mind lately:

At 31, I believe it’s now or never. I've concluded that being a jack of all trades isn't suited for me. I know what I want to achieve first, buy a house, get savings started. I aim to accomplish this objective and utilize it as a foundation for developing habits to attain my other ambitious objectives.

Have you ever felt like this, what are your thoughts ?