Not at all. Shonen manga is a broad category, and while Shonen Jump is a well-known and significant publisher, there are numerous other publishers and online platforms that feature shonen manga. It's a diverse landscape with various options for fans to explore.
Shōnen manga was a type of manga aimed at young readers. It usually had a relaxed, humorous, and emotional theme. Here are some comics that I think are more suitable for young readers:
[1] The Attack of the Giant-This is a very popular Japanese manga that tells the story of the battle and survival between humans and giants.
2 " Blade of the Extinguisher "-This is a work adapted from a light novel, telling the story of a young man searching for ghosts. This work had a very high combat element and thrilling plot.
3 Naruto-This is a classic Japanese manga that tells the story of a ninja village. The story had many complicated plots and battle scenes, as well as many deep character descriptions.
4 The Fullmetal Alchemist-This is a very popular Japanese manga about two brothers who seek the principle of equivalent exchange to get what they want. This work has profound philosophical significance and human thinking.
5 Death Note-This is a work with sci-fi and reasoning elements about the Death Note created by a genius high school student and his struggle with the dark forces.
These are some manga works that I think are more suitable for young readers. I hope you will like them!