Window coverings attract dust. Use window shades or curtains made of plastic or other washable material for easy cleaning. Closets need extra care. They should hold only needed clothing. Putting clothes pin a plastic garment bag may help.
Dust mites like moisture and high humidity.
Cutting down the humidity in your home can cut down the number of mites. A dehumidifier may help. Air filters may be of limited help by keeping your home cleaner and more comfortable. Ask your doctor for advice about air filters. Cover bedroom air vents with several layers of cheesecloth to lower the number of large-size allergen particles coming into the bedroom.