Thank you for asking! I always appreciate seeing folks who want to improve their writing.

There is no how a human will exist without a unique gift.

This sentence mixes tenses, and is very difficult to parse. I think you meant something along the lines of "There is no human without a unique gift"? But there are so many extraneous words.

While you showcase, Knacksteem is so liberal that they reward your work, and expose your talent to the world.

What? Where does being liberal come into it? Why is there a "while" there? I am entirely confused.

The word talent is like a plot of many fruits.

It's like a what now? Is that a metaphor? What does it mean? A plot, like in a field? Is this a metaphor in a language other than English that you translated literally?

Many people have a different ability, and knacksteem put this into consideration.

I'm gonna attempt a re-edit here:

"People have different abilities, and Knacksteem is aware of that."

Is that what you meant?

Also, I will fling a little about a few features, and I will share my ideas.

I'm trying to figure out what word was meant instead of "fling," and I honestly can't.

These are just examples. Most of the sentences in the post have at least one grammatical issue.