Should I make my retirement accounts a bit more conservative, if I expect a market crash and beginnings of a recession next month?

I’m middle aged, let’s say, with a potential retirement about 15 years out.

My IRAs have some bonds but are heavily invested in large cap mutual funds. I anticipate another market crash next month when investors see empty shelves and realize tariffs still exist.

What would make sense if I want to reduce my exposure temporarily? What would be a reasonable approach?