I don’t know who needs to hear this but you can’t “ruin” 2021 by making hopeful statements about it, people on the internet are not making prophecies, bad things don’t happen because you dare to hope for good things.
I know all the jokes are fun but I would like to earnestly and sincerely remind you that none of it is real. Nothing anyone says, hopes or “predicts” about the year to come has the power to cause future events. You’re allowed to say that you hope 2021 brings good things for you. You will not be somehow punished for that.