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Ill be honest, i only read about half of the prologue, if that. But i can say that i saw some blaring mistakes. First off, everything is jumbled and superficial. Your writing style consists of "LOUD NOISE!!! Ship was hit by ray, people who died still cant figure out what ray was. Guy who that was dead is now open eyes in house full of holes. World doesnt make sense since he is scientist and stuff isnt sciency. He vows to figure out world". It is like a 4th graders summary of a book he hasnt read.
First thing you need is organization. Know when to tell what is happening and when to do an info dump. You kind of mixed them together and created something that lacks flow. To see if your story flows right, check to see if you have to read a sentence more than once just to understand what is going on. If you have to read it twice or more, that means some changes are needed.
Next is grammar/vocab. You lack a good understanding of english grammar, which leads to it being hard to understand. And your vocabulary seems a bit short. One of the big things an author needs is a large vocabulary. This leads to less repetitive wording and increases immersion for readers. Also spelling is off, i mean you misspelled prologue, so it isnt the best :/

Lastly, you seem to just summarize instead of telling a story. A ray hit the ship, but what did the ray look like? How big was the ship? How did the react to it? You missed a great opportunity to catch your readers attention. In summary. Give us greater detail.

I advice you to read a novel and take notes of how it is written. It will help you out a lot. I know i was a bit tough, but i only have the best intentions in mind.

GoldenSlime a possible rewrite of the synopsis could be:

Xxx was a top scientist who discovered a new civilisation - unfortunately their new neighbours blew his ship up with a modern weapon!

Luckily xxx was reincarnated in a new world - only to face an ancient dragon as his first enemy!

Despite losing his life, xxx's desire to unveil the mysteries of existence and magic piqued the ancient dragon's interest - and xxx was reincarnated again. This time as the strongest abcd... on prehistoric earth!

Join xxx as he investigates the mystery of magic... and finds out who reincarnated him in the first place before that dragon?!

GoldenSlime

2 points.

1st, you can have grammar or typo mistakes in the book chapters; that's easily ignored. It's harder to ignore bad English in the synopsis. I surround these with pointed brackets "< >"

2nd, some details that aren't that interesting; you don't have to tell the reader in the synopsis. Since they are going to find out very soon in chapter 1. These I put square brackers "[ ]"

E.g.

A great scientist who died without knowing how he died. Fortunately, an unknown being forced him to reincarnate in a world of magic. A world where <the> impossible becomes possible, where he decided to look at <why at? At implies he has found it and can research it?> the mystery of magic.

[Upon getting a clue about it he set on an expedition to look at it.] There he met an ancient dragon who has slumbered for a long time. Both of them fight but Kevin lost and died, the ancient dragon gives another chance to Kevin <this section just sounds like you are shortening the chapter 1 and telling a summary; it doesn't read as a complete sentence> [as he manages to cut one of his legs. ]

Then Kevin reincarnate<s> to another world, his original world 'Earth' <comma?> but the time period he reincarnated <into?> is a little off as he was reincarnated in the prehistoric era where there is nothing and survival is hard.

Join Kevin as he struggles to survive while he looks for the answer [he didn't discover in his previous lives]. <weird sentence>

EDIT: So you can critique and comment as much negative things or points of improvement for mine too... I earnestly am just trying to help ok?
https://www.webnovel.com/book/11594239806435805

I rate the current synopsis a 2.5 out of 5 stars due to the grammatical and spelling errors, the lack of vocabulary, and the unnecessary information that was dumped on the readers just by reading it.

An example of what you should change: your first two sentences had these unnecessary words and grammatical errors included that would immediately decrease the readers' curiosity towards it

Let me do a bit of fixing. So, instead of your current "A great scientist who died without knowing how he died. Fortunately, an unknown being forced him to reincarnate in a world of magic. A world where impossible becomes possible, where he decided to look at the mystery of magic." which is a major turn off just by reading,, try something like this:

"With no idea how he died, Kevin found himself forcefully reincarnated into a world full of mysterious magic and arts. As a great scientist back on Earth, he vowed to find how the impossible happened to him while experiencing the mysteries of the magic himself.

However, during this process...(you continue it)"

That's just an example, and you don't have to use the exact words as well.

Anyway, my example is just one of the many things possible but isn't it cleaner and much easier to read? You can then think about how exactly you'll make a good and eye-catching synopsis without divulging too much unnecessary information.

Oh, and also, please download Grammarly. Although it won't fix everything, it'll help you on your grammatical and spelling errors.