What can be done to decrease the gonial angle? (Photo)

First, why are your teeth so much proclined after braces treatment? You are ideally all four premolar extraction case. As not all your teeth are visible, so tell me any extractions done during your braces treatment? After this, I can guide you for treatment and retention.

After seeing your photos below are positive findings: 1. upper and lower arch not symmetric. 2. upper left central incisor tip is not perfect. 3. gummy smile - less crown height. ideal option in your case is first go for crown lengthening process and after that aligner to align teeth.

Yes, you can for alignment. In such cases, the only issue is, it will result in increased/more overjet. But with IPR, it's possible to reduce and can achieve close to the normal range. Another issue will be upper to lower midline, it will not match. but this is not visible, so no need to worry...

In your case for a perfect answer, cephalometric analysis is a must because it is a surgical case. but if you do not want to go under orthognathic surgery, your orthodontist's plan of braces with TADs is the best option. One more point take into consideration is your age, with age bone becomes...

As you mentioned, you feel your face has shrunk after pre-molar extraction. However, I believe the reason is not the extraction itself; you can experience changes after retraction of teeth, but not immediately after extraction. It's my advice to upload a side view of the face photo and front...

Your bite is perfect. The result is really good. Give a few months [2 to 3 months] to settle the bite. After that review, and if any issues contact your orthodontist. The bite will settle during the retainer phase.