Who Are Genuine Book Lovers?

or

The People who Say They are Genuine Book Lovers

I found thatsaw one twitter user who boasted about how many books he had read and introduced himself as a book lover.

This sounds more natural in the US.

He seemed to be an influencer and let people know about his recommendations.

Your sentence is correct but this sounds more natural to me.

I couldn't help laughing at them because all of the one hundred books he recommended were self-help books.

I'd like to admire him tofor read a bunch of similar booksing so many books of the same type without losing his interest.

Your sentence is technically correct. This is an US alternative.

People are prone to feel like they understanding everything and becominge clever when they read self-help books.

The "they" is needed here to reference the "People."

Self-help books are useful toin encourage themselves anding people to quickly figure out the essence instantlyof matters.

I'm not sure what you're trying to say here so this is my best guess at a correction.

However, the essencefiguring out process is likely to become meaningless due to the lack of details and accuracy.

Again, this is my best guess at a correction. We don't usually refer to the "essence" of things in the US.

Though I can't introduce myself as a book lover, I have enjoyed history books, science books, novels, art, and essay froms since my childhood.

"Essay" needs to be plural like the rest of your examples.

I guess that one aspect of reading books is exploring the world which we never come across.

Your sentence is correct. This is an alternative sentence.

Genuine book lovers must be judged by a variety of books as well as athe amount of books they read.

Since we're referring to the amount of books read by book lovers, we can use the more specific article "the" instead of "a" or "an" here.