Will wearing a retainer again fix my teeth?

I got my retainer about a year and half ago and stopped using it after a few weeks. Now I am noticing that my overbite is coming back (although not as bad as it was before I had braces). If I start wearing my retainer again now, will it help reverse my overbite? There is a large gap between the back of my top teeth and the retainer. I am willing to wear the retainer for long periods of time in order to fix this.

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