Like many people here I had around 67GB used in "Other" for storage. I use Filza for a file manager a lot and didn't think it would cause any issues. I realized that Filza DOES NOT auto delete your trash bin. I had around 50GB in trash because of this.
Solution: Navigate to Filza app, Go to settings (bottom right cog) > Trash > Empty.
This seems stupid but a lot of people including myself have never cleared this. This is not for sure to clean up your "other" storage but a possible solution.