Molds love to hang around and grow on wet dirt. Use your dryer. Laundry dried outdoors can pick up pollen and spores from the air. Try to use your dryer instead. Unclutter your life.
Less knickknacks collect less dust.
Use a double-bag vacuum. An ordinary vacuum can actually leave ten times more dust around after you use it. Vacuum twice a week, at least. And if you do it yourself, consider wearing a mask. It's curtains for Venetians.