Btw talking about kaijuverse what does it actually about? (I'm sorry it might be off topic but i'm genuinely interested)
I mean i am a fans of japanese heroes series so i watched kamen rider super sentai, space police gaban (or is it gavan they pronounce it gaban here tho) and ultraman.
But never the kaijuuvverse all my knowledge about it was the godzilla game in gba and another monsterverse game
I'm watching those series too! I'm finishing off the original Kamen Rider with the last three episodes presently, but then I plan to watch Ultraman and I'm so excited to begin my journey with that in particular. The history of Ultraman and Eiji Tsuburaya as a director and the influence it has on a vast amount of other media told to me by my friend was probably one of the coolest things I've learned about in a while.
To answer your question to the best of my present ability if I understand it right is that the Monsterverse tends to be a very large collection of movies, (some were anime movies too) that are loosely tied to eachother, some having more coherent strings then the most.
For example, we know the very original Gojira film in 1954, that had a sequel called Godzilla Raids Again which was a duology that introduced us to the fearsome King of All Monsters in such a superb (and admittedly terrifying fashion) It was a recent watch for me, but the effort that went into making Godzilla actually terrifying was jaw-dropping! That film is beautiful if you have the patience for things in black & white, although there was a rare release of it in colour in a screening.
Raids again gave us another monster, Angurius (love him to pieces) and I love how the films take their time to explain their lore and origins with being tied to Atomic Bombs and the sad history of it with Japan. Gojira was made with the intention of showing how it felt like to be present of those dark and awful times, as Ishiro Honda and Tsuburaya himself were alive during those times.
After Raids Again, we got Rodan in 1956 which is based off the pternadon, and his debut movie, then we got Mothra vs. Godzilla in 1957 which introduced us to the amazingly adorable and fearsome Mothra (she's my absolute favourite) tackling Godzilla.
The fun parts of these movies is seeing how future movies have them all together, in Ghidorah, the Three-Headed Monster (1964), we see Godzilla, Rodan and Mothra all in one movie duking it out!
If you love tokusatsu like Gavan, Ultraman and etc it is absolutely worth a try delving into if you have the patience for films. The films have a lot of charm too, and a sense of humour which develops in Mothra vs. Godzilla. The films sometimes have a string of consistency between releases (as so far I've only seen up to Destroy All Monsters in 1969) and I love my time with them so much.
I've rambled a lot, but I hope this helps!