You should have your dentist check your bite on both sides to make sure everything is even. You may need additional aligners to correct that.
There are basically 2 options. One is to do a root canal / crown lengthening and a new crown. Based on the x-ray, it looks like this option does not have very good prognosis. It seems like too much of the tooth structure has chipped , too close to the bone. Your second option with better prognosis is the implant ( given you are a good candidate for it).
first you have to figure out why the teeth are bring chipped....was it due to an accident? or a misaligned bite? or perhaps excessive grinding and clenching while you're sleeping? then you and your dentist will come up with a treatment plan considering the cause and your expectations. Composite bonding or veneers are good options. You may need to adjust the bite with orthodontics ( if your dentist determines a bite issue) or wear a night guard if you're a grinder.
One reason could be that your bite is not correct and the teeth don't come together with even force. You can see a dentist or orthodontist to find out about orthodontically moving your teeth so that the forces of occlusion( biting ) get distributed more evenly. Also if you have habits of grinding your teeth at night or day, then you should look into getting a night guard/bite guard.
Your teeth should move according to the clincheck plan. Sometimes if the contacts between the teeth are too tight, or there is no room for the tooth to move, one or more teeth could lag in their movement. Go to your dentist so they can determine why that tooth hasn't been moving. They may need to make new aligners, relieve to contacts , etc,.....
