Hello,
It's simple.
While they are doing other network marketing they can look SFI, it's up to you find the right way to invite them to look at.
With a smile on your face promote SFI.
Tell them all about the company, about your sponsor (sponsor is the person who represents the respect and gratitude).
In the end, they can say: "If I managed why would not you?"
I hope that's my answer helped.