Do I need BSSO + Lefort1+ Sliding Genio? (Photo)

I would recommend dental and skeletal analysis with an orthodontist and Maxillofacial Surgeon. Looks like you may need mandibular advancement after further orthodontic treatment. A sliding advancement genioplasty is also a compromised option.

It would be easier and more effective to either have a sliding genioplasty or a custom jawline implant made to make the lower facial improvements that you seek. At the same time you could have infraorbital-malar implants placed to augment this area as well.

I would see an orthognathic surgeon.  They might suggest to undo what the orthodontist had done. If it was me I would only advance the lower jaw alone. The upper jaw seems to be fine. Perhaps add genioplasty.