I've spent several years periodically writing and developing a high fantasy story I mean to turn into a book, or even a series depending on how much material I write. However, lately, I've realized I do not like the plot I was planning at all, and I'm wondering if my work is at all salvageable. I started with creating a completely new and unique world with new races, politics, dynamics, fauna, physics, and a lot of characters I plan to use for my story. I love what I have created, and I think this world has a lot of potential.
I then started to write the story and defining/developing its characters. This took a long time, as I wasn't entirely sure where I wanted the plot to go yet. I had some vague ideas, which slowly fleshed out over time, and I steered my plot in that direction. Some live events did not allow me to continue for a while, so I was forced into a hiatus. When I returned to continue working on my story, I noticed I had fallen for pretty much every trope imaginable.
A brief overview of my current plot: My main character is a no-name teen who turns out to have an exceptionally strong magical power within. He joins a rag-tag team of adventurers who help him travel the world fighting generic evil. They collect parts of a strong ancient magic weapon said to be able to defeat anyone. Then a strong before unknown enemy arises to wreak havoc on the earth, and it falls to my protagonist and his party to defeat it with the reforged weapon he collected during his travels. The protagonist's childhood friend turns out to be evil and helping the enemy due to being jealous of not having the magical power, and the protagonist's long-lost dad returning is an important sub-plot to help unlocking his powers.
As soon as I realized this was the plot I was going for, I decided I hated my story. I don't want to fall into the same pitfall as James Cameron's Avatar movie, with a beautiful and unique world which everyone loves, and a story as cliche as it gets as it's basically just Disney's Pocahontas with aliens. Everything I could think of at the time has been done in a large number of narratives, and I seem to be ticking boxes rather than creating something unique.
Given I've written about a quarter of my story so far, which defines my characters and world and sets them up for their journey, what is the best way to proceed? Should I cannibalize my current story as much as possible and use bits of it in a plot, risking that some setups might fall flat or create plot holes? Should I start over entirely, discarding my hard work towards the narrative, and start from scratch with my new plot? Should I continue with my current plot, and try to steer it away from the tropes and redesign it to be unique as possible regardless?