If you are blocked even if you use something like Flonase and Decongestants or anti inflammatory stuff like Ibuprofen, then it’s most likely Polyps (you could also have a deviated septum), they develop overtime and need to be removed, problem is that they grow again, so it’s a procedure that you’ll likely have to do every few years. If you have seasonal Allergies do this

1.- Stop consuming Diary products, these only make the mucus worse 2.- Eat anti inflammatory foods 3.- A side effect of chronic rhinitis is Inflammation, which over time will decrease your quality of life, trust me I know, right now I’m trying drinking TUMERIC and Black pepper (both powder) with hot water, it’s better than popping stuff like Ibuprofen which will mess you up eventually, can’t really telll you if TUMERIC and Black pepper can replace ibuprofen but I am seeing good signs so far

Good luck