For the past 2 years or so, I have been using vocal warm ups and exercises to attempt to increase my upper range. I can go down to an A1, but I cant comfortably sing higher than an E4. My choir director keeps pushing me to go higher because the highish notes that I can hit have pretty good tone. I don't know whether my range has reached it's peak and I'm destined to sing on the staff, or whether I just need to practice more. Thank you to anyone who has any suggestions.