To add to the thor discussion and what Sin said, Thor showed that there’s divine power inside him waiting to be unleashed in the Rgnarok saga.
He one shoted Durok (for those who know him he is a Surfer level threat) along with a portion of Loki’s army just by releasing his inner godly energies.
Sentry and Blue Marvel can be written in this level and I also agree with ID than Xman could reach this level also.
Then there’s Superman who can pull insane crap like super singing and Hulk who can get angry enough to fart planets out of existence.
For me an ideal character to transcend herald level would be the one who would use the Quantum Bnads to the full potential though