Ignore the ppl that ask u to keep using it. It's already not repairable. Since it keep leaking. It's a tear than a puncture.
Plus your tires one more mm going to hit the minimum mark. Just change new, don't risk it and get stranded.

Just because the puncture has occurred in the minor repair area, doesn’t necessarily mean it can be mended. British standard BSAU159 also defines the maximum size of the damaged area in order to carry out a safe repair. So if the diameter of the damaged area is larger than 6mm, a repair should not be attempted. This means it may be possible to repair a tyre that has been pierced by a nail or a screw, but if the damage is caused by a larger item such as a bolt or other metallic debris, the tyre may need to be replaced. This also means that tyre damage such as splits, cuts and gouges cannot be repaired. Reference

6. Don’t overlap repairs.  If a new puncture is in the same place as an existing repair, then the tire should be replaced.  Don't have it repaired.
Reference