You need to get out of your comfort zone and try new activities / things until you discover something that resonates with who you are.

If you're in the valley, go jump at Skydive Monterey Bay. Sign up for a rock climbing clinic at Castle Rock. Go to wine tastings. Or data science meetups. Or founder events.

As an introvert myself - you will never achieve happiness unless you expand your horizons and open yourself up to serendipity.