Herewith, five questions to ask yourself before taking on a new project. Sharks don't grow new fins. For free agents, what you learn is just as important as what you earn. If a potential gig teaches you something new, it's a winner. If it doesn't and you're swamped with work, take a pass.
Personal networks are one realm of life where quantity often trumps quality.
Your network should be strong. Gigs that help you meet new people and establish new connections are generally better than those where you work with the same old folks. Then take it. Build one portfolio. Diversify the other portfolio.