Minor crack top left corner why does my phone keep clicking repeatedl

If the "ghost tapping" started happening shortly after your screen was damaged, it is certainly caused by that. You can look for a screen replacement (I recommend getting one with a frame, it's way easier) on ebay/amazon/local stores for around 35-40 usd and that would almost certainly solve your problem, just make sure you follow proper repair procedures, such as discharging and disconnecting your battery. I also recommend looking for a guide on YouTube to decide if it looks easy enough for you to do or not. You'll also need a basic toolkit, the iFixit Essential Electronics Kit is a great option for this repair, though you can maybe a find a part on ebay that comes with the tools you need (though they will obviously be of much lower quality).