What do I do about my teeth moving after having braces? (Photos)

I had braces 3 years ago and I lost my first retainer which was replaced two weeks later but my teeth shifted. When I lost my retainer again my Mum couldn't afford a new one because at the time money was tight. Since then I haven't worn anything and although I found my retainer a year after I lost it, the teeth wouldn't move back into place. Since then I have been unsure about what to do as I am now a college student and still tight for money. Is there a cheaper alternative to braces?

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