What does a defensive investment strategy actually look like if you’re still buying every month?

Not trying to time the market or call every top. But the just keep buying no matter what, same amount, every month, forever answer feels too simple when things look genuinely stretched.
For people still adding regularly but wanting some kind of process that accounts for conditions, what does that actually look like? More cash on the sidelines? Smaller adds? Getting pickier about quality and valuation?
I'm not going to stop investing, just want to make decisions that are more intentional than ignore everything and buy anyway. I'm trying to gauge what people who've actually thought about this do.