The only way to reduce the stuff you have is to declutter something from your house every day. Have a box in the garage and put at least one thing in it every day. When it is full drive to a thrift store and donate it. If it's half full and there is a thrift store pick up, then leave it on the curb for them. A good thing to do is to donate something every time there is a thrift store pick up, which in my area is about once a week.