Finding one’s voice is an act of self-discovery. Finding one’s niche is an act of finding out who in the world thinks you’re interesting. Voice is brand identity; niche is market segment. Voice, inside out; niche, outside in.
A playful mind is inquisitive, and learning is fun. If you indulge your natural curiosity and retain a sense of fun in new experience, I think you'll find it functions as a sort of shock absorber for the bumpy road ahead.
As Mumford observed almost a century ago, the world loses its soul when we place too much weight on the ideal of total quantification. By doing so, we stop valuing what we know to be true, but can’t articulate. Rituals lose their significance, possessions lose their meaning, and things are valued only for their apparent utility.