Belief is social. If you can appeal to a group they have membership in, they’re more likely to switch. If it sounds like you’re a member of an out group, you’re going to struggle.

So like if you’re trying to get a evangelical to stop littering, framing it as like Jesus told us to shepherd the earth will probably work better than saying anything about scientists.

Also if you’re trying to get someone to, like, stop believing in qanon, you’re probably going to need to get them to leave that group. If they keep hanging out on those forums and groups, the brain is going to treat you coming with facts similar to how it would treat a threat to its physical safety. The brain really strongly prioritizes group membership. Probably because in prehistory, getting kicked from the group was extremely dangerous. If you can get them to no longer see the other cultists as their primary group, the transition is easier.