I hear you.
51-year-old weak intermediate here, two colds since November. When school ends, my kids will stop bringing home viruses for a while, that should help.
I notice that sleep is critical for colds. If I get consistent plentiful sleep, my colds are almost un-noticeable. One night of shitty sleep and my cold turns very bad.
Do you snore? Have you checked for sleep apnea?