The author felt that his positive thinking strategy had worked well because, although he had been ill and disappointed with places like Hor and Darchen, things eventually turned in his favour: the weather improved, more pilgrims reached Darchen, and he could finally begin the sacred kora around Mount Kailash.
\[ \text{Initial Situation}: \text{Illness} + \text{Disappointment} + \text{Loneliness at Darchen} \] \[ \text{Strategy} = \text{Positive thinking} \Rightarrow \text{Hope for better health, company, and conditions} \] \[ \text{Outcome}: \text{Improved weather} + \text{Arrival of pilgrims} + \text{Start of kora} \Rightarrow \text{Strategy successful} \]
Hence, the eventual improvement in circumstances convinced the author that his positive thinking had indeed worked well in the end.