Determining which skill to master when you have *many* different interests

In Cal Newport's book ['Deep Work'](https://amzn.to/2QyMd5O) he convincingly argues that there are two core skills for thriving in the modern economy:

> 1. The ability to quickly master hard things
> 2. The ability to produce at an elite level, in terms of both quality and speed

Independently of whether one agrees with him, there is no denying that mastery or `deep expertise` in a chosen subject is a valuable asset (arguably, these days, even when one speaks of a 'generalist', they are a generalist _within a specific area_).

I suspect however that many people suffer from the same issue I do: a lot of diverse interests.

> So how do we pick which one to focus on for the purposes of the second point above? 🚀

I have a few thoughts on this but would be interested to hear how others have chosen to go about this, or thoughts in general on this topic. 🔢