I have moved the price table to another page, so I can use my website in the meantime. You can find it here: https://de-schrijfgids.nl/?page_id=737
Thanks for your quick answer! I was able to solve the problem using the link with information about changing my URL. I did not know how to do this, because I could not access the admin area anymore, but following the steps I could do it via the functions.php file. Thanks again, you really helped me out!
