Hello Radha,
As per your requirements, you can not change the vastu of your house related to the construction. Then you can only go with the direction of placing the articles in your home, can provide you a good vastu for your home. For this requirement, you can go with some links given below & place the things in their right place as per vastu.Living room Vastu
Bedroom Vastu
Bathroom Vastu
Kitchen Vastu
Dining Room Vastu