Why won't my impacted canine tooth come down with braces and an exposure?

I've had braces for a year and my ortho tried pulling down my impacted canine from the front for 7 months. The tooth didn't move at all. I then went for an exposure 5 months ago and had a chain put on the back. The tooth has barely moved but it is not "mobile" according to my ortho. My braces treatment was supposed to be over by now. What are my options? Any ideas?

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