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The medicines you are taking are mostly for cough and not for nasal congestion.
1. Haridra Khanda (Haridra, Triphala, Trikatu, Nisoth, Nagar Motha, Ajowan, Kutki, Chitrak, Ela, Dalchini, Jirak, Dhania, Ajamoda, sugar, etc. with Lauha Abhrak Bhasma) one teaspoon mixed with one teaspoon honey, taken a day after food thrice.
2. Anu Thailam (Cedrus deodara, Cyperus rotundus, Glycyrrhiza glabra, Lotus, Solanum indicium, sesame oil, cinnamon, and goat milk) two drops in each nostril, twice a day. When you put this nasal drop, it may come to your throat, in which case spit it out. If you swallow it mistakenly, it is fine as it is harmless.
3. Mahalaxmi Vilas Ras (nutmeg, camphor, Swarna bhasma, Rajat bhasma, Vang bhasma, Abhrak bhasma, Shuddha Gandhak, Kajjali, Tamra bhasma) one tablet daily after food.
These medicines are available in Ayurvedic stores.