I have two accounts one gonna be legendary, the another account have a high character but no all dlc's, they say me they can't move that character to the another account, the only way i have now is forget about it or erase, and i really wanna keep it alive, so what can i do
You can't do anything but pick an account to focus on. One will be F2P and the other will be Legendary. I wouldn't necessarily say "forget about him", but maybe you could delete your more powerful toon and recreate him on your Legendary account. You'll have to grind again, but there isn't anything you can do.
Well i thinking in use an token to reset the power of the highest character in the principal account and create a new one with the power gonna desappear
That would work also. As a Legendary member, you'll have access to 4 more character slots. You could just remake him and make him your main character again. It would take time, but you can power through it.