What do you think, is it good?

In addition, this project was challenging for me because  of its vocabulary and content. For example, the vocabulary of this novel at the beginning was a little hard because it had a lot of words that I didn't know, so it was a big challenge to understand because I couldn't imagine the story or stay enthusiastic about reading it; however, in the middle it became easier and entertaining, and it kept me more interested in reading it. The other thing that became challenging for me was that in my opinion the content was slow and it had too many details, because this novel had 22 chapters and the story happened in chapter four and five, so there were 17 chapters where the novel talked about the Sibyl's trial, which was boring and exhausting for me.
However, I could find too many benefits with this project, because I learned specific, general and new vocabulary, which helped me be more confident and I could imagine the story as if I had read it in my native language. For example, at the beginning I underlined many words that I didn't understand, but after a while it was hard to find vocabulary that I didn't understand. Moreover, I figured out that I can read a novel and understand almost everything. Experiencing this success made me happy when I read the novel. Now, I would like to read another novel because I'm convinced that by reading a novel or book, I can learn a lot.

puedes usar "boring" , es una buena aquí

What do you think, is it good?

In addition, this project was challenging for me because of its vocabulary and content. For example, the vocabulary of this novel at the beginning was a little hard because it had a lot of words that I didn't know.  This made it a big challenge to understand because I couldn't imagine the story or stay enthusiastic about reading it. However, in the middle it became easier and more entertaining, and it kept me more interested. in read it. The other thing that was challenging for me was that, in my opinion, the content was slow and it had too many details. The novel had 22 chapters and the story happened in chapters four and five, so there were 17 chapters where the novel talked about the Sibyl's trial, which was boring and exhausting for me.
However, I could also find too many benefits with this project, because I learned specific, general, and new vocabulary, which helped me become more confident and I could, allowing me to imagine the story as if I had read it in my native language. For example, at the beginning, I underlined many words that I didn't understand, but afterwards, it was hard to find vocabulary that I didn't understand. Moreover, I figured out that I can read a novel, understand almost everything, and read faster. All of them these things made me happy when I read the novel. Now, I would like to read other another novel, because I'm convinced that reading a novel or book learning can help me to learn!

Bien hecho! Tené cuidado con los "run-on sentences." No intentes poner demasiado ideas en un oracion; dividilo a dos o más oraciones seperados. Estoy feliz que adquiras más confianza en tus habilidades.