Not an isekai, but it does have isekai elements. I think the villain might be transcendent. MC reads a book that ends up being a prophecy for her future. She decides to change her behavior and run away before her perceived father, the emperor, kills her for being a fake princess.
MC has lived a long full life as a sorceress and decides to pass away. Instead of dying, her magic turns her into a youth again. She decides to go underground and try to fulfill her life wish and find true love. However, her disciples have lost their path since her reported death, and she must bring them back together to defeat the ultimate evil
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