something meaningful at stake. Link achieving your ultimate goal to a significant reward, and make it binding and enforceable.
Use small rewards to build good habits. Motivate yourself or others along the way by using smaller incentives linked to specific steps needed to achieve the overarching goal.
Beware of backfire effects. Financial incentives can ‘crowd out’ your intrinsic motivations, so be careful that rewards (or penalties) don’t undermine good intentions.