A little more than one octave, and the range is a bit narrow. You can widen the range through scientific practice. It is best to hire a teacher. When singing, you should be confident and pay attention to the focus of your breath (sounding, enunciation, articulation, pronunciation, mouth shape, etc.)

The last and most important thing is: you The sound produced must be consistent with the expression of the content and emotion of the song (all techniques for producing sounds are geared towards this).