hello dcsprivat
:-) looks like you broke your original screen :-). Few parts of it should stay in the screen and make free place for a new ones. All front camera assy - should be screwed to a screen bracket, that is left in the housing of your phone. You have to take it off from the housing - be carefully - front camera flex is highly delicate and damage to it may lead to loss of function FaceID. Should be better for you take it to a proper repair shop (in my opinion you haven’t competencies and tools for it).
PS, There is still the problem of screws, which I do not see here. They could have stayed in the brackets or had fallen out. Anyway, without knowledge and experience you will not be able to finish it.