Keep current home as rental?

We are looking to buy a larger home for our growing family. We currently live in our house in a great part of Dallas, Tx.

My husband bought the home in 2020 at 3% interest at $475k. We owe $320k. We could likely sell for $750k.

We are looking to purchase a new home for $975k but not sure we can handle potentially 2 mortgages if we can’t find renters.

Our combined gross incomes are $370 per year on the lower end (I fluctuate). Would appreciate any advice