Mendell Station by J.B. Hwang

At the beginning of 2020, Miriam's best friend, Esther, dies. The two women had been friends since they were teenagers. Esther's death unmoors Miriam, who finds herself now in her her early thirties questioning her faith and wanting to be alone. She quits her job at a Christian school and goes to work as a mail carrier just before the world shuts down because of the pandemic. A quiet book, Mendell Station, follows Miriam's life in the six months after Esther's death as she comes to terms with a world that doesn't include Esther. A good read-alike for You Can't Stay Here Forever.