Serendipity is those "lucky" moments when coincidence occurs in unforeseen, beneficial ways. It's the opportunities that arise that we may attribute to fate. Being at the right place at the right time.
A good strategy for life is to work on increasing your surface area for serendipity. It's not that you can force unforeseen, good opportunities, but you can increase the likelihood of this occurrence by increasing your surface area to it.
The way surface area is increased is by doing the work. Gaining experience. Working on your ideas. Shipping your work. It's about meeting people, continuing on your unique path. Avoiding distraction and doing the meaningful work that is in front of you. This way, naturally, you position yourself so that serendipity can occur. Not forced, but by the natural flow of things.