How do you stop feeling so isolated postpartum

My baby's a month old and my husband has recently gone back to work. All I do is take care of baby and keep the house tidy as much as I can. I don't expect to do much having such a young baby but I feel so.. stuck? I'm without a car so I can't even just go on walks in the park with her. Don't get me wrong, I love my baby and motherhood has been amazing for me. I just wish I wasn't so lonely and restricted to the house.