Made the mistake of not wearing my retainer regularly and the gap between my two front teeth has returned?

I made the mistake of not wearing my retainer regularly and unfortunately, the gap between my two front teeth has returned. My teeth are perfect apart from that unfortunate gap and I was wondering if it would shift back into place if I wore my retainer day and night. I've heard stories of people going years without wearing their retainer and then wearing it for several months and its correcting things, but I want to know if this is true. Thanks!