Congested and coughing

I beleive my little one has a cold, super congested and coughing randomly. We put a dehumidifier in his room, no temp, fussy for the first part of the day and didnt want to take a bottle but eating from the breast no problem. Usually goes to sleep at 730/8, but feel asleep at 6pm, woke up at 8 to feed, get changed and passed back out.

Any other tips or tricks to help him feel better sooner or help with the congestion?

(We tried saline spray when he was little. Did not go over well, and his boogies arent drying in his nose and he lets us suck them out till its clear from what we can see)