IP blacklisted - What to do now?

Hello,
I recently got the following error when casually signing up for one of my niches onto YouTube: 'Sorry, we cannot serve your request for a new account at this moment.'

So I googled that error and others had the same problem because of their IP being blacklisted. Now I looked up my IP with whatismyipaddress.com/blacklist-check and it gave me three positives.

I always clear whole browsing datas of Firefox in CCleaner and always use a fresh Elite Proxy but I still get that error... I also tried resolving that issue, but all those sites refuse to delete me from the list.
It seems that I have a dynamic IP since everytime I reset my router, I get a new fresh IP which is blacklisted as well, so I came to an end with my solutions.

Now I am asking you guys: What to do now in order to be still able to create YouTube accounts?

Thanks in advance!
Sincerely,
anfyd