Glad you found something inspiring in this. But would just like to clarify that the Gita is not about pursuing anything in the manifest world. It will cause confusion if read from this lens. 

The Gita is about pursuing God / the Creator / Higher Self / Unmanifest Reality. It's not exactly about pursuing any other goal that we can perceive directly with our senses. The suggestion you are referring to is to remain active and engaged with the world, but to renounce the fruits of one's actions (ie. completely release any desire for outcomes). This is not the same as enjoying the process, because that would still imply some attachment to outcome. In other words, you wouldn't even bother with the process, if it was not aimed at a desirable outcome. 

You may ask what becomes the basis for any action then? Well the suggestion is that one must fulfill one's duties as hinted at by one's inherent nature. Essentially, you use your natural strengths and temperament in service of others, with no desire for personal gain. In the final stages of this practice, even the sense of agency (sense of one's free will) is surrendered to the Higher Reality.  

This is called Karma Yoga. A good illustration of what this looks like is documented in the book The Surrender Experiment by Michael Singer. 

Basically, all of this is makes more sense when you personally come to the conclusion that lasting happiness can never be found in the ever-shifting experiences of this transient world. And so you wish to go beyond it and seek out direct contact with that Inner Reality that is the source of ever-new and ever-lasting truth-consciousness-bliss.