But the reality is, if an account have bad post history it will likely cant join a good sig campaign or the worse, it can get banned. Goodluck selling your account
First, you get banned only if you continuously posting spam posts, not because you had some of the posts very low quality a year ago.
Second, I checked your post history and nothing impressive as well, sir. Just for comparsion, I would advertise your account as up to 10% are giveaways or not considered eigible for signature campains, at least 90% is normal/lower quality posts.