"No More Otherworld Summoning" or "I Won't Allow Any More Otherworld Summonings"

I was summoned to another world. I was told I was a saintess. I was asked to save the world. I saved the world. When I asked to be sent back, I was told it wasn't possible. ……But there's still something I need to do. Rather than a "serves you right," it's revenge. If it's an "can't return" type of otherworld summoning, wouldn't the original world also be at risk? Since I can't return, they won't find out anyway—this was made based on just that idea.