I don't have any BTC address or PGP key associated with that bitcointalk account.
Then I personally wouldn't expect a positive outcome from your account recovery attempt.
I provided a lot of evidence which proves that account it is mine
Not the kind of evidence that is sought after in these scenarios, though. I also wouldn't claim your evidence to be conclusive by any measure. You provided a message that could not be verified.
I can tell you what PM I sent or received in the whole history of that account, what bigger proof than that could be ?
The bigger proof would be an associated Bitcoin Address or PGP Key that you can prove ownership of. PM history is not something that is used to verify ownership of your account, so I'm not sure why you believe that is substantial.
In 1-2 hours I will get back home and I will try to make again that signed message for ethereum.
Please attempt to verify the message yourself prior to posting it here, so that you know you've at least done that correctly.