How to practice when singing unsteadily?

The instability of singing breath needs breathing training and vocalization practice, which is the most basic and simple exercise to train vocalization skills.

Singing breath is the driving force of vocalization and the basis of singing. Without a good breathing method to control and use breath, there can be no beautiful singing.

Vocal music practice is the most basic and simple practice to train vocal music skills. In fact, it is to practice the most basic and simple motivation or phrase that constitutes the melody of a song with simple vowels or syllables, and to move up and down a semitone within a proper range to practice singing repeatedly.