The six voice types
Bass E2–E4
E2-E4 - the foundation. Rich low end most singers cannot reach.
Baritone A2–A4
A2-A4 - the most common male voice type, warm and versatile.
Tenor C3–C5
C3-C5 - bright upper male range; the rock and opera hero register.
Alto / Contralto F3–F5
F3-F5 - the deepest common female voice type, dark and full.
Mezzo-Soprano A3–A5
A3-A5 - the most common female voice type, balanced across registers.
Soprano C4–C6
C4-C6 - the highest common voice type, agile and brilliant on top.
Grow the range you have: pitch control practice with the pitch pipe and interval trainer does more for singing than chasing extra semitones at the extremes.