Occlusion needs to be addressed
I am glad you send your question. It can be very frustrating as a patient when teeth move and relapse occurs. Occlusion, or the bite needs to be evaluated in detail to understand what the underlying factors may be which may be contributing to this. Once determined where the ideal bite should be positioned, then alternatives to treatment can exist, which may include, either reconstruction, or orthodontics as options to better help your situation. All of which may be approached conservatively when treating.
All the best,