Don’t hard sell anyone. Do this instead.
Just show people that you care. Show them that you truly want them to succeed. With or without you.
Show them that you have unique insights. That you can be trusted to give good advice. Even if that means sending them to someone else who’s a better fit. That's how you win in the long-run.
Because maybe that person can't afford to pay you today. Maybe they're still not in a position to do so next year. But 5 years from now…when they need help and are in a position to pay...they will. Or they'll refer you to someone who can.
Play the long game.