Warming up will help keep your voice from getting injured. How to warm up your vocals: You need to do a lip roll, and when attempting this keep your jaw relaxed with your lips closed. Attempt to make a motor boat sound with your lips. The motor boat sound is what a lip roll should sound like if you are doing it properly. When you are doing a lip roll, make sure you keep your stomach relaxed and try not to push, just let the sound flow out.
Look for a vocal coach, because doing incorrect techniques can ruin your voice. They have programs where you can learn how to sing online. That way you can teach yourself how to sing. Your vocal muscle will be strengthened and with the right instructions, you can learn how to use your resonators to project a powerful voice. Even if you can already sing, having a vocal teacher can help you learn how to sing better.
Find your vocal range. The tone in your voice is much more important than the range. Never sacrifice your voices’ tone for it’s range. Learning how to do this could teach you how to sing higher. The better your vocal tone is, the better your vocal range will become.