Baby with other kids

I feel like I’m going insane. What is everyone doing to prevent your baby from getting sick with having other children. I have a 5 1/2 year old (kindergarten) and a 3 1/2 year old (normally in preschool but staying home with me right now) and I feel incredibly anxious about me and the baby getting sick. She already got RSV bc both of my kids were sick since I have taken her home and I felt like I was taking every precaution possible prior. Now that she’s healthy again I don’t know what else to do! I’m doing laundry like 3x a day, washing things that haven’t even been touched. Im having my son change and wash hands when he gets home, i have humidifiers going, and hand sanitizer everywhere. Any advice would be great! We live in NJ.