Your photos show us part of the picture. To give you a definitive answer we need more info.That said, we will give you some ideas.You have a deep overbite which has caused your gap, or at least will not allow closure of it orthodonticallywithout first treating the overbite. Thus, you need to also treat the lowers. Braces or Invisalign can be used.With the orthodontic treatment, the gap very likely will be closed. Deep overbites can lead to breathing problems when sleeping as we age, so treating the overbite now solves multiple problems now and in the future.If only closing the gap is your main concern now, see a qualified cosmetic dentist to do some bonding on yourfront teeth.