I followed the steps in the tutorial of Sorry, you have been blocked but I keep getting this message for my own website ‘https ://10stappen.beleggen.com’, but also on other websites like ‘https ://beleggenchallenge.funded-account.com’
I tried to add a rule on Zone-level Web Application Firewall (WAF) but it looks like my IP adres is blocklisted on a different level?
Looking at the the IP address you mentioned above, it appears to be a classic dynamic IP address, according to the name scheme your provider has chosen.
A dynamic IP could previously have been used (in bad faith) by another customer, where you now retrieved an previously abused IP address, and as such, takes some sort of consequences as a result of it.
I would generally advice against it.
That being said, -
What operating system (including version/revision numbers), do you use?
What browser (including version/revision numbers), do you use?
What is the full list of extensions (including version/revision numbers), installed in your browser?