Here are some sentences I found in the ESL001 writing review forum:
My hobby is reading books, as it allows me to explore new worlds, gain knowledge, and improve my imagination. I enjoy reading novels, short stories, and poetry, especially in my free time. Books help me relax, reduce stress, and enhance my vocabulary.
I removed the comma after "books" because the phrase "as it allows me..." is essential to the meaning of the sentence, so the comma is unnecessary.
And second and third sentences I think their puntuation is already correct, following proper comma placement in lists.This is how I would punctuate the description to improve text clarity:
My hobby is reading books as it allows me to explore new worlds, gain knowledge, and improve my imagination. I enjoy reading novels, short stories, and poetry, especially in my free time. Books help me relax, reduce stress, and enhance my vocabulary.