According to Vastu Shashtra and your Rashi , birth star rashi and Lagna the North and East facing house is most suitable for you.
Your house is already North facing so you have follow some following Vastu tips :
1. Your main entrance should be as given below map
2. Internal parts of house should be as following direction.
|Pooja room/place||North East direction|
|Bed rooms||South,North,Noerth , North West,North north East|
|Store room ||Noerth West|
|Latrine||South south west, East south east|
|Guest room||East, West|