Is masturabation good enough to improve sexual life?

it would depend on what you mean, masturbation through phone sex sometimes brings a little more excitement into the bed or watching ur partner masturbate sometimes helps you see what pleases them most.. & if u ment jst doing it solo, the answer is still yes

if a male masturbates bt practices self control by NT allowing himself to cum, it will improve their sexual performance

yea, i totally agree. It has good practice of self control, like he said, to control your "cum" or sperm.