After reading Letters to a Young Athlete by Chris Bosh, one of the key things that stood out to me was finding your why. This concept applies not only to sports but also to business and life in general. Once you realize why you are doing what you are doing, you can gain a better understanding of how to improve and find endless motivation by delving deeply into why it matters to you and what you are trying to accomplish.
https://www.amazon.ca/Letters-Young-Athlete-Chris-Bosh/dp/1984881787/ref=asc_df_1984881787?tag=bingshopdesk-20&linkCode=df0&hvadid=80401879906389&hvnetw=o&hvqmt=e&hvbmt=be&hvdev=c&hvlocint=&hvlocphy=&hvtargid=pla-4584001432974214&psc=1