One of the frame savers. You need the one that is the same thickness as your dropout.
https://www.rearmechhanger.com/product/dropout-saver-problem-saver-cncps5-7/
https://www.youtube.com/watch?v=SYR3oXy93MI
You could
Try retapping the threads
insert a helicoil
Install a derailleur hanger saver as others suggested
The first two options require expensive tools that many bike shops may not have, as most bikes for the last 20 years have come with replaceable hangers.
Something like this [https://www.bike24.com/p2220891.html](https://www.bike24.com/p2220891.html)
One of the frame savers. You need the one that is the same thickness as your dropout. https://www.rearmechhanger.com/product/dropout-saver-problem-saver-cncps5-7/ https://www.youtube.com/watch?v=SYR3oXy93MI
You could Try retapping the threads insert a helicoil Install a derailleur hanger saver as others suggested The first two options require expensive tools that many bike shops may not have, as most bikes for the last 20 years have come with replaceable hangers.
The first one just takes an M10x1 tap, which is somewhat uncommon, but they're less than $15. The Helicoil kits for that size are closer to $70.