So for everyone who read Model there is one exercise he mention to improve your voice. You plug your nose and speak using only your chest voice. If you get nasally sound then you know your doing it wrong. One thing about this exercise its boring. So i figured i can do it while singing. So plug your nose and sing. Funnily i found out the real reason i was a bad singer was because i use head voice. Now im a decent singer and have a good voice xd good luck people