to be fair, RoR characters are the hardest to scale. They have feats and statements like splitting the sky, moving at the speeds of much higher than light, creating all of existence and then a blow that barely destroys 5x5 m stone square can kill them
I’m not sure if Frieren would defeat Gojo, after all, she has never shown her full arsenal of magic. However, Macht, a character who will appear in the second season and is a mage of a similar level to Frieren, would easily defeat Gojo and the entire Jujutsu universe.