How to Reset (Save File Location)
Go to the Vampire Survivors preferences and under general turn off cloud saves. Then go to C:\Program Files (x86)\Steam\userdata in your own files.
Go into the folder that is string of numbers (this is your user id) in that folder will be a bunch of numbered folders go to “1794680” (this is the game id different for each game if you ever wanna try this with another game) there will be a file called “remotecache” delete that.
If you ever want your previous save file back turn back on cloud save and you should be prompted if you want your local files or online. Select Online. (I am unsure if the cloud save will stay so do at your own risk).