@alexisalexi4053 what you are describing sounds like a failed screen. In particular this 'there is a black circle" is indictive of a broken screen. Time to replace it. Since ifixit doesn't yet have a specific guide for this, use something like [https://www.youtube.com/watch?v=2e_7RBFqA98|this video] Replacement screens are readily available at many online stores.
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 a device with the same issues as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.
Repair is War on Entropy!