All his solo showed us that no matter what Loki will be forced into the role of a villain. It’s why he was arrested, and it was made it clear he was back to his supervillain ways. A hero doesn’t get arrested. The Cul thing just proves that it doesn’t matter if someone takes the role of villain because at the end of it all, it will only be for a short while before Loki resumes the role.
You know what I think it would be best if they bring another Loki in, that way at least he can bear the burden of being the villain that everyone wants. Or better yet take Loki away from the Asgardian stories altogether. Thor doesn’t really care for Loki and doesn't really think of him as his brother. Freyja is more than happy to feed him to the wolves and will try and make sure that Loki will fulfil the role as a villain.
They have already basically reverted everything that Kieron Gillen and Al Ewing set up. Loki has been regressing ever since AOA. Sure, he’s done some small heroic stuff, mostly for his own benefit. Loki will never be seen as a hero.