Excuse me Madam or Sir. But, I think they copied your story or were inspired or it was all a big coincidence.
Your fanfic that was copied (or inspired or coincidental) was Forgiveness~ HTTYD Dagur x Reader (Sequel to Betrothed).
And the referring account is @HarumidemonMatsune.
I say this because the plot, title and even the cover are similar! I have no idea if you gave permission for a translation into Portuguese, but if not (and if it is indeed a copy), as a fellow writer from Brazil, I have to tell you! I will be ashamed to have to report a fellow writer from my country for copying, but copying is a crime, it would not be acceptable for someone to grow up at your expense.