Great questions. Itโs all about making people change behavior - so we have to consider a couple of viewpoints:
who has the formal and informal power in the team. Ie does everyone do as the team lead say, or are there others who direct or influence the team significantly the team?
does your imitative have formal backing? It might come from a retrospective as a team improvement, it might come from management, it might come from you yourself
many books have been written about the topic. A good place to start could be:
Thank you @jesper for the interesting points you mentioned about making people change behaviour !
It makes me think about the different personalities as well, few years ago the project manager did a personality test and asked everyone to send the result.