I have a villager breeder that keeps getting raided, its in the mountains, the raiders when it gets raided often get stuck in the mountains and I cant find them. Im lost on what im supposed to do because the raid is still happening but I have no idea where the raiders are so i cant kill them
get yourself a village bell and place it down anywhere you like (you can even take it with you so you no longer have to run all the way back to where you placed it down). Ring it and any pillagers that are nearby will have the Glowing effect applied to them so you can see them through blocks in the way.
It won't last very long and I'm sure there's a limit to the range, but it's long enough that you should be able to turn around 360 degrees to see if any are nearby.