The ways to motivate are :-
1)Communicate as often as possible with your down line .
2)Guide,teach & help them to succeed in their SFI business.
3)Set up competition and rewad them as you desire.
4)The hard working downline get gifts, may be you can inform them as per your desire.
5)Appreciate all their acivements.
6)At least thank them in all their winnings.
7)Above all lead by example as an awesome sponsor.