How can I close my gap without braces?

I've had a gap between my front teeth since I was a child, I got braces when i was 16 and had them for two years. After braces my teeth started mobing back to their original place even though I wore the retainers, my dentist refused to put the inside retainers for me. I really wanna close my gap but i dont want to go through braces/invisaligns since i dont have the money for it. Is there any other way I can close my gaps permenantly ?

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