What procedures need to be done to move my teeth back into place after I have already had Braces and stopped using my retainer?

I had braces for 18 months in 2012 to correct a minor tooth alignment. My canine tooth came in above my baby teeth as some did not fall out. Because of where the tooth came in the orthodontist thought it would be best to just bring my canine tooth down to where my premolar is. So my premolar and canine tooth are switched places on one side of my mouth. After braces I wore my retainer everyday for 6 months, then I slowly stopped wearing. NOW it does not fit, canine tooth sticking out forward

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