Greetings Zonan!
Thank you for reaching out to us.
Issues like this may occur due a corrupted save file that you might have in your Conan Exiles folder → \Conan Exiles\ConanSandbox\Saved
Usually, when you unninstall and reinstall your game, your saved files are maintained so we suggest that you delete your singleplayer files altogether.
If you want to first test this, save them outside of your computer first, then delete the ones that remained and start Conan Exiles again. Hopefully the issue will be solved!
Do let us know if it worked Zonan!