We all have a variety of interests and things we like. Modern hustle culture and winner takes all markets suggest that we focus on a single things and get really good at that while sacrificing other parts of our interests. Book - Steal like an artist.. 10 things nobody told you about being creative argues otherwise: Embrace the different interests and you will see how these different parts feed into each other.
For a famous example, Einstein passionately played the violin.
Additionally, embracing different interests is also how new combinations of fields emerge, think of "Psych of Play" as a YouTube show or my own journey to combine psychology and computer science. A Zettelkasten that makes varied connections between topics that seemed previously unconnected is the scientific equivalent of this line of thinking.
The book also argues: We should not forcefully search for some sort of congruity in the things we do. The line connecting all of the things that we did is that we are the ones that made them.
Is there any research on happiness here that could be cited? That spreading our your interests is great for happiness? That would link this with Play is part of an essentialist life and Downtime and relaxation aid insight