It's actually a question that make me have to tell you and others a very personal reason in my real life. So at the moment I don't think that I should tell you what the reason is, if not for privacy I have requested a change of my username by creating a thread.

Ah, that's totally understandable

Additionaly, creating a new account would cost me a payment for IP address am I right ? So why would I do that if I already have an account that could access me free here. Also nothing would change my account is still a newbie. Creating a new one would just waste my time

That's only if that IP address has "evil points" so to speak. You could try creating an alt to find out but if you're using your main without such issues, the same should apply to your second.