I nasal rinse regularly when my allergies get bad and it helps a lot.

It’s also pretty easy to make a fairly cheap air purifier with some air filter vents and a box fan that will get a ton of allergens out of the air in your house. I made someone alone to this with a 20 inch box fan and merv13 air filters. One day I’m going to make one with a flame out of wood and use it like a foot rest or “coffee table” type thing.