the best fengshui tip i can give that has a significant effect on your luck is to change your main door. the main door is usually the wooden door, not the metal gate; or the door that is connecting the house to the outside/ road. the least that you can do is repaint the whole door.
this beats rearranging the furnitures or even painting your house a different color.
changing your main door is like freshening up your luck to become more timely or current. in fengshui, when you first move into the house, you activate your luck at that time. and such luck have certain characteristics, which is usually calculated by the fenghsui concepts. but this luck usually just lasts for just a certain period, then it expires.
thus, it is important to change the door, if you want a fresher luck.
note: do not do this only if in the past you have a string of bad events. if this is the case, you might want to tilt your door at a different degree. or consult a fengshui professional.