Dear Olga,
I deleted yesterday all the child theme codes which were added by the unavailable speed optimization expert last year but FID is not fetching and the issue remains unsolved. I contacted Google support and they informed me that i am having these theme related issues https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.bedbazaar.nl%2F
One more time your assistance is required, please. Thanks