In any of the big acting cities, there are breakdowns that the casting directors put together for the projects that they're working on and then they get sent out to the agents and stuff like that. It's difficult to find projects, sometimes, unless your agent or manager is submitting you for those specific projects.
I cannot overstate how much a generous spirit contributes to good luck. Look at the luckiest people around you, the ones you envy, the ones who seem to have destiny falling habitually into their laps. If they're anything like the fortunate people I know, they're prepared, they're always working at their craft, they're alert, they involve their friends in their work, and they tend to make others feel lucky to be around them.