“Time to stop shrinking the balance sheet”?

In Powell’s speech today, a NYT reporter commented, “Powell notes that the market strains in the past three weeks have shown that now is the right time to stop shrinking the balance sheet. He said there is little to be gained from trying to shrink the balance sheet further.”

What does that mean to “stop shrinking the balance sheet further”? What’s the implication of all that? Thanks in advance!