Godzilla Earth is not a fanfic. It has its own official production and creative process, distinct from fan-created works. It's a legitimate entry in the Godzilla canon.
I recommend Godzilla 2: King of Monsters to you. The plot is about aliens attacking and threatening Earth. At the same time, Godzilla fights with other giant monsters like Mosla, Ratton, and Kidora. In the end, Godzilla helps humans find little Godzilla and defeat the aliens with the other monsters. I hope you like this fairy's recommendation. Muah ~😗
The King Kong Skeleton Island and the new Godzilla were both fictional worlds that did not exist in the real world.
However, according to the novel knowledge, both the King Kong Skeleton Island and the new Godzilla were part of the Monster Power Corporation series. In this fictional world, the Golem Skull Island and the new Godzilla were both electric monsters whose purpose was to become stronger by absorbing electricity.
Rumor had it that King Kong would fight Godzilla in the new version of Godzilla. However, this was just a rumor that had not been confirmed. At present, the plot of the next battle with Godzilla had not been announced yet.
The King Kong Skeleton Island and the new Godzilla were both part of the storyline of Godzilla 2019. King Kong Skull Island was a fictional island in the Pacific Ocean in the movie. It was one of the nests of Godzilla. On this island, Godzilla had a fierce battle with the humans. The new version of Godzilla was a fictional monster that appeared again in Godzilla 2019 and was part of the same worldview as the King Kong Skeleton Island.
According to the trailer, King Kong would be facing off against the new Godzilla, which was also an important plot in Godzilla 2019. In the next movie, Jin Gang and Godzilla would meet again and work together to fight against the threat from the future.
For developing the plot, you could introduce a new, powerful enemy that neither Godzilla Earth nor the existing characters in the crossover world can defeat alone. So, they have to combine their strengths, like Godzilla Earth's raw power and the other characters' strategic thinking. As they fight together, they also face internal conflicts within their newfound alliance. Some may not trust Godzilla Earth completely, and this mistrust can create interesting sub - plots and character development. Eventually, through a series of events and battles, they overcome their differences and defeat the enemy. This could also lead to a changed world view for all the characters involved, and perhaps a new status quo for the fictional world.
One idea could be that Godzilla Earth teams up with a group of humans who have developed advanced technology to fight off an alien invasion. The humans initially fear Godzilla but soon realize they need his power.
One characteristic is that they often have a strong environmental theme. This could be about climate change, deforestation, or pollution. Another is that they might use fictional settings to highlight real - world environmental problems. For instance, a story set in a future where the oceans are dead can be very impactful.
You can try some popular fanfiction websites like FanFiction.net or Archive of Our Own. They usually have a wide range of fanfictions including those related to Godzilla Earth.
I recommend "The Last Cultivator on Earth". The protagonist of this novel not only sealed a passage to save the Earth, but also went to the Ming River to extradite his master, explore the lost past of the Nine Realms, and walk a path that defies the heavens. This novel combined elements of fantasy and oriental fantasy. It was very interesting and attractive. I hope you like my recommendation. Muah ~