It sounds like you are experiencing 'rebound congestion,' a common issue where overusing fast-acting decongestant drops actually worsens blockage over time. For safe, long-term relief, the first step is to gradually stop those temporary drops. Excellent long-term pharmaceutical options include daily intranasal steroid sprays (such as fluticasone or budesonide) and regular saline nasal rinses to safely reduce inflammation. Since this has lasted for two years, I highly recommend consulting an Ear, Nose, and Throat (ENT) specialist. They can evaluate you for underlying issues like allergies, a deviated septum, or nasal polyps, which may require specific medical or minor surgical treatments for a permanent solution.

For long-standing nasal polyps, the primary treatment is daily use of corticosteroid nasal sprays, such as fluticasone, mometasone, or budesonide. These are very safe for long-term use and work by reducing inflammation to shrink the polyps. Combining these sprays with daily saline nasal rinses will help clear your nasal passages and improve the spray's effectiveness. For severe blockages, a doctor may occasionally prescribe a short course of oral corticosteroids, like prednisone. Since you have had this condition for many years, I highly recommend consulting an Ear, Nose, and Throat (ENT) specialist to evaluate your sinuses and discuss personalised, long-term relief options.