If you think of the built in keyboard:
When you don’t press the letters but slide downwards slightly, you get the number instead of the letter. That’s a feature.
I don’t think a keyboard can “wear out”. I’m also using mine quite a lot, and haven’t had problems with it, except that I’m hitting wrong letters sometimes (i instead of u, b instead of v) - but that’s me missing the right letters, not the keyboard.
There could be a problem with your screen, though.
Try restarting your iPad.
Here’s what else to try:
If the screen isn’t working on your iPhone or iPad