Can you extend your vocal range? The simple and easy answer is; yes! Whether you've been singing for decades or days, you can always work on your vocal range. Unless you've achieved Mariah Carey-status vocals, there's always room to grow.
Can you train yourself to sing higher?
But having taught more than 500 students, I can tell you this: Anyone can learn to hit high notes without straining. It just takes some practice and the right singing techniques. And I promise that if you learn to hit those high notes without straining, you'll be amazed at how much you can expand your vocal range.
Can you train your voice to be higher pitch?
Yes. You can't completely change your voice, but you can definitely alter it. ... If your voice is deeper than you'd like, then you can use your upper chest voice or your head voice to sound lighter or higher in pitch. Sing up a scale from your lower notes/voice until you're comfortable with a certain pitch.