I mean, there is many ways to do that, but one way is to instead of asking a single person you let people apply. For projects that are not as attractive you up the compensation/bonuses till someone is interested.
Then they made the choice themselves and even if the project sucks in the same way, they made the choice themselves.
An important rule of low/no budget film-making is: no mattee who is in your crew/cast, know why they agreed. For an established actor that might be trying out a new or different acting style, a different role, whatever. For the sound guy it might be learning the tools, or going to a certain landscape or some compensation. Know what motivates your people besides the salary and treat that motivation like the most valuable secret intel tou could have ever aquired.
Then they made the choice themselves and even if the project sucks in the same way, they made the choice themselves.
An important rule of low/no budget film-making is: no mattee who is in your crew/cast, know why they agreed. For an established actor that might be trying out a new or different acting style, a different role, whatever. For the sound guy it might be learning the tools, or going to a certain landscape or some compensation. Know what motivates your people besides the salary and treat that motivation like the most valuable secret intel tou could have ever aquired.