Yes mate
At the time back in 2018
made mistake with afew posts with Plagiarism
That's it, when it comes to plagiarism, even if a few years have passed when the moderators notice it in the forum and once your account will be banned. And as others have said, even if you appeal, the chances of recovering your account are small.
You know that kind of offense is equivalent to a criminal case if we look at it. It's a pity that your account is at Hero rank. You can't do anything but accept the painful incident that happened to you here. Just go back to your new account here in the forum, at least you know what to do because you learned a lesson now so you will be more careful now.
to be honest most members would rather come back using their old accounts rather than create a new one coz leveling it up is such a hassle, but if it means that you are only using it to gather more knowledge or just to learn not earn then i'd prefer using new accounts with clean records since it's much better to access and you didn't have to think of anything for your account.