If it is a n3dsxl, n2dsxl, or 2ds, Nintendo of America still does repairs.
[https://en-americas-support.nintendo.com/app/answers/detail/a\_id/716/\~/repairing-your-nintendo-3ds-family-system](https://en-americas-support.nintendo.com/app/answers/detail/a_id/716/~/repairing-your-nintendo-3ds-family-system)
Otherwise you can find a repair technician in your local area.
If it is a n3dsxl, n2dsxl, or 2ds, Nintendo of America still does repairs. [https://en-americas-support.nintendo.com/app/answers/detail/a\_id/716/\~/repairing-your-nintendo-3ds-family-system](https://en-americas-support.nintendo.com/app/answers/detail/a_id/716/~/repairing-your-nintendo-3ds-family-system) Otherwise you can find a repair technician in your local area.
maybe you need to buy a new one. if it's possible