My voice keeps cracking but it isn’t getting deeper. Why is that?
Your voice cracks because your vocal cords are getting longer, but your brain once in a while forgets and treats them as if they were still shorter. This causes the cords to bang into each other or to be in the wrong position to make the sound you expect to come out of your mouth.
All your life your brain has tuned the pitch of your voice based on the feedback it gets from your ears. There is a natural tendency to strive to keep the pitch of your voice like it was in childhood. As your vocal cords get longer, your pitch deepens. Your brain compensates by keeping the cords tighter, but eventually, it will get tired of the extra effort and your voice will drift downward. You can encourage the change by practicing speaking at a deeper pitch that is still comfortable for you.