Should I leave recently transferred money in cash in my IRA?

A few weeks ago I transferred money from my TSP to my IRA. It just arrived and is sitting in cash until I buy funds with it.

My question is (and, I ask this knowing we shouldn't try to time the market), since the market in the US is pretty volatile right now, with a very high possibility that it will get worse until it gets better (hopefully), should I just leave it sitting in cash for now? I keep watching the market go down, and I know there's still more to come with tariffs going into effect... I'd rather not watch what I have in cash dwindle along with all my other investments.

I know it's smart to buy low...I just feel like it's going to get much lower for a while.