Luke Murray says newcomers should say yes to every opportunity for experience and income, then gradually say no to clients and projects that don't fit their strengths. His camera operator Sam did this, narrowing his client base to those he could serve best.
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So if you're starting out, you need to say yes to everybody, and as fast as you can, you need to start saying no to people, which sounds like the exact opposite strategy, but it's not. So my camera guy, uh, Sam, he had to say yes when he first started out to every single person just to make money. And eventually, as he got better and better, he was able to realize these are the people that I can serve best, and so I need to only say yes to them and over time let the folks that I have been serving just die off, or at some point even break up with them.