That's quite the time jump! With some luck you can restore your character from a backup though
Here's how to do that:
In the file explorer, go into %APPDATA%/Secrets of Grindea and find the Backups folder. In here you should see folders named after all your characters. Go into the appropriate folder. The auto 0-4 are rolling backups. Sort the folder by date to easily see which of them was made last! The “005h” and alike are permanent backups made every hour.
Choose a backup you think is appropriate, and copy it to the “Characters” and/or “Worlds” folders. Replace the save file of the slot you want to recover by deleting its save and renaming the copied backup to the correct slot. The 0 save file corresponds to your first save slot, 1 to the second, and so forth.
Hope you manage to save your dude!