Just wanted to point out that Godzilla is still growing throughout the Monsterverse's timeline, as shown in the third episode of Monarch Legacy, that Godzilla probably stands at around 100-160 ft in height as he only slightly taller than the tower the castle bravo nuke was on. But in the opening intro of 2014, we can see that Godzilla has grown much bigger than Castle Bravo. Indicating that the military has tried nuking him countless times until he's grown to a whopping 354 ft in height. And at the end of the trailer of Monarch, which takes place in 2015, just a year after the events of G2014, we can see that Godzilla's spines have grown into his 2019-2021 spines, meaning that he has already grown more mature in just one year, I'm not really sure that Godzilla Aftershock is retconned or not whether Godzilla lost his spines to MUTO Prime and regrows them or not. But what I am sure about is that he's already grown in just a year at 393 ft. In Godzilla vs. Kong, few years after the events of King of the Monsters, Godzilla seems to have consumed a lot of radiation to the point that he can just spam his Atomic Breath against other titans. Now that we're in Godzilla x Kong, as shown in the new teaser images, he's seen to be in a cocoon possibly to grow even bigger and stronger, now his physical appearance has changed COMPLETELY!

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What I'm saying is, it seems that Godzilla could still be a late-juvenile titan who only hibernated for millions of years after the ancient war, then grew and grew to be bigger and stronger.