In cold seasons, the air is dry and less humid. Hence you should continue steam inhalation. Steam will also help to liquefy mucus, however if the mucus is excessive, you may take a mucolytic
like n-acetylcytine, bromhexine
. Anti-histamines may help reduce the mucus but may also cause the delicate nasal mucosa (lining) to dry. Is one nostril
perpetually blocked or are they alternately blocked? Have you had any investigations done earlier?