There is no safe or healthy way to fix your teeth without the help of an orthodontist. Anything you try could end up seriously harming your teeth!
A retainer with certain springs in place has the power to change the position of your teeth over time, but it’s something you’d have to wear 24/7 until your problem is fixed, then you’d have to wear a regular retainer every day for an undetermined amount of time after that. There’s also InvisiLign, but I don’t know much about that besides the fact that it makes your teeth look super shiny.
Of course, it could also be a more serious problem regarding the alignment of all of your teeth. After many years of orthodontic treatment (some of which gone wrong) I have a permanent overbite that cannot be fixed. It’s only a cosmetic thing that bothers me on occasion, but I’ve learned to deal with it. Only a select, lucky few are born with perfect teeth. You’re lucky that a slight overbite is all you have to deal with!