Any suggestions what kind of Amnesia CS should I made?

[Cranky Old Man]

Yes. I have been thinking and can't think and make a new or unique storytelling, location, atmospheric areas... etc.

So can YOU tell or suggest me some ideas to improve my upcoming little mod?

Thanks for your time.

So you want to make something new and unique in every way, but have no idea exactly what.
That's easy: Make a chess mod for Amnesia!
No? You don't think it will fit? (Me neither.)
Then what DOES fit for you? If you turn down chess mods, then you must have some kind of idea. I'd say that "not chess" is a good start. What ELSE don't you want to do?
If you want to make a mod, which will take months, you must have some kind of idea behind that compelling force. If you don't have the driving force, you wouldn't want to make a mod in the first place.
Naturally, I'd personally want you to make a thought out horror mod, so start thinking about what would be scary. Actually don't START with that, because you'll have plenty of time figuring that out while building the levels, which will take up most of your time anyway.