Loki’s knows so many secrets Odin buried deep centuries before the start of the MCU, he’s also a changed man because of Hiccup. How will the events of his escapades in the Viking Era reshape the future? It’s a good thing a different Variant already broke the Sacred Timeline because he’s long since passed his Nexus Event.

How could one little choice change everything? He didn't mean for it to have gone this way, he just didn't want to get into as much trouble with his inventions and Loki seemed his way out…who know the god of tricks and mischief could actually make his life easier.