My phone won't charged after it falls off the ground

@feruu could be a damaged battery but that is less likely. What is more common is either a damaged charging board or a torn, disconnected flex cable (charging board to main board).

Use something like this guide Remplacement de la batterie du Samsung Galaxy A50 to work on it. Step 16 in this guide shows the charging board and the flex cables. Here is a guide specific for the charging board replacement Check for any damage, torn or loose cables.

If you have any issues identifying things, you can always post some images of what you find with your Question. That way we can see what you see. Ajout d'images à une question existante

While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has the same problem as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.