Definitely nasal drops, and you can use one of these nose suckers, several versions, but they are absolutely incredible!! I use Baby vapor rub on his feet and chest too.

I would do a cool most humidifier to thin the mucus. If you have saline spray for infants use that and a bulb syringe. Nurse or feed frequently if there’s a fever and monitor for stridor since it’s RSV season.

Basically if wet diapers and eating normally, just try to keep him comfy and it should pass in a few days. If he has a fever at all bring him in. Has he had his dTap?

Try running hot water in the bathroom n sit with him in there for a little bit