How do we fix a narrow adult arch during orthodontic treatment? (Photos)

I have always been missing my right lateral incisor. Im about a year into my treatment. When I smile 6 teeth are clearly visible. I wish my premolars were kicked out a bit. Ideally 8-10 teeth clearly visible. Before treatment, I was talked out of an implant. Later in the course of the treatment we talked about removing one of the premolars or the lateral incisor to fix asymmetry. But we both came to the conclusion that it might thin out my upper lip too much. I'm willing to even start over!

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