Sure, the One Piece manga is still in the Wano Arc. There are many intense battles and plot twists happening. The arc has been quite elaborate and full of surprises.
One interesting 'One Piece Wano fanfiction' could be about a new character who is a master swordsman from Wano and teams up with Zoro. They go on adventures within Wano, facing off against new and powerful enemies that were not shown in the original story. This could add more depth to the already rich Wano arc.
First, you need to have a good understanding of the One Piece world, especially the Wano arc. Read the manga or watch the anime carefully. Then, think of an interesting concept. It could be a new adventure for the characters, a different outcome for an existing event, or a story centered around a minor character. After that, start creating your characters (if any new ones) and plan out the plot.
Although Star Travels and One Piece were both different types of works, they had different sources of inspiration, so there was no plagiarism.
Star Travels was an animated film with the theme of adventure, dreams, and friendship. It was inspired by the famous comic, Journey to the West. One Piece was a manga with the theme of adventure, pirates, and the sea world. Its inspiration came from the anime of the same name created by the Japanese manga artist, Oda Eichiro.
Although the theme and storyline of the two works were different, the source of inspiration and character setting were independent. Therefore, even if there were similarities in some plots or character designs, it could not be said that they were plagiarized or borrowed.
The Wano Arc has indeed come to an end. It was a long and action-packed arc with many memorable moments and plot twists. The conclusion wrapped up various storylines and set the stage for new adventures.