I checked your account and it seems that the htdocs directory is missing. Please note that when you deleted the domain from your account and added it again last week, the directory your domain was linked to was changed from htdocs to pimpleletta.com/htdocs, but your files have not been moved to this new location.
Please create a new folder in your account with the name pimpleletta.com, and then move the htdocs directory into it. That should fix your website.
I don’t fully understand why this results in a 403 error, you’d normally see a 404 error in situations like this. But I think this may work anyways.