You can't move teeth without braces.
Just get braces again for a month. Then you'll never have to have them again.
I had braces for like 4 years, and they finally got taken off around 4 years back, but my teeth moved since then. I've now had some put back on , and the new brace is almost invisible, because the brackets are tooth coloured, you only see a thin metal wire. Most people don't really notice.
And I'm just happy to have it sorted out. I'll have a retainer for a long time, but that's the price to pay for nice straight teeth.