[Orthodontics] 3rd correction in my life

When I was young, I had the first full orthodontic treatment 3 years ago, and about 2 years later, my dentition returned, so I had the second orthodontic treatment again 2 years later. About 10 years later, I had a habit of biting my lips. Because of that habit, the lower dentition was slightly misaligned, so I started partial correction of the 8 lower teeth. The director recommended Inbijeol because he had interdental removal, but it took longer, so I just went with the iron route. Maybe it's because I went to a dentist's office that doesn't put wires behind retainers, but why am I the only one who can't maintain my teeth after braces? So this time, I'm starting by checking to see if a retainer is used. Does everyone do a lot of re-correction? Please let me know if you have any tips for maintaining your braces well after correction. Thanks in advance!