This might sound obvious, but:

Spending time frequently with different groups of friends with different value systems, each of which (you believe) has an accurate map of different parts of the world.

My experience:

My rationalist friends help me inject more empiricism/anti-happy-death-spiral memes into my church experience; my church friends help me keep other memes like "non-smart people are still worthwhile," "actions perceived as demonstrating character and virtue aren't all just signalling," and of course the "no sex, no drugs" purity meme.

I am in favor of all of the preceding memes but tend to forget each of them over time if I spend too long in a community that doesn't observe them.