5 month old runny nose

Hi mummies! My LO is having a runny nose, with sneezing (clear mucus, no fever, no cough). His nose is not blocked but I can hear the mucus gurgling inside when he breaths / drink milk / takes a pacifier. His appetite is still good, doesn't seem to be having difficulty breathing either. What can I do to help him overcome this faster? I'm using sterimar baby nasal spray and also the lollababy nasal aspirator but his mucus keeps flowing