My career is almost entirely based on serendipitous connections. While they are random chance, of course, the one thing I take credit for is having (what I like to call) an “aptitude for serendipity”. I try to create as many opportunities for luck to strike me as possible.
Some ways I try to influence serendipity are:
Personally, publishing open source projects has been a great way to do this. There is no downside, assuming you Solve your own problems, and the upside could be career-defining. My career was defined by react-boilerplate being posted and upvoted to the HackerNews frontpage!