Well, a really cool plot could be that Harry's connection to Hela gives him an edge in the fight against Voldemort. He might be able to access a different kind of magic that Voldemort doesn't understand. For example, Hela's power over death could be translated into a way to counter Voldemort's Horcruxes. Maybe Harry can use his new - found powers to find and destroy the Horcruxes in a way that no one else could, all while coming to terms with his new heritage.
One idea could be that Harry discovers his true mother is Hela and has to deal with the new identity. He might face discrimination from some in the wizarding world who fear Hela's reputation. Another could be that he inherits some of Hela's powers, like the ability to control the dead in a more magical way than normal necromancy in the Harry Potter universe.
Perhaps Harry, as the son of Hela, is hunted by dark forces who want to use his connection to Hela for their own evil purposes. He then has to go on a journey to find out more about his mother and her powers in order to protect himself and the wizarding world. He could also meet characters from Norse mythology who are related to Hela in some way and they could either help or hinder him.
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