Your iPhone Is Just Too Damaged
For the most part, your iPhone can take a few drops, but that doesn’t mean it’s invincible.
If you don’t take good care of it, you might end up with a broken iPhone. If that happens, you should really consider upgrading it.
After all, sometimes upgrading to a new iPhone is actually cheaper than repairing a huge issue with your current device — especially if you don’t have AppleCare+, which is unlikely on an older iPhone.