I don't know the location of my ancestral grave. I went to the wrong grave a few years ago. How to solve it?

Ask the elders at home or in the neighborhood. See if anyone remembers the location, if not. Don't go to the ancestral grave, just put a coffin at home and send money. Also, draw a circle at the intersection near home, leave an exit, and then send money. You can send it at the same time and let the deceased collect the money.