Encourage people to change their behavior

If you want to change someone’s behavior,  approach them by encouraging what is right rather than criticizing what is wrong.
Praise is more effective in changing behavior than punishment.

Set examples.
As Plato says, punishing people for doing wrong would be stupid. Instead, be a good example and show them the right behavior.

Find other motivation than money.
Using money as a reward would make someone feel that they are only doing something because they are paid to do it, decreasing their enjoyment of the job.

Install systems and rules that encourage the behavior you want.
Never let it pay someone to behave in a way you don't want. Have systems that make it hard for people to get away with undesirable behavior and make them costly. The painful consequences of it must outweigh its pleasurable consequences.