How to decrypt kook extension by ransomware

hi

my computer has been infected by ransomware. it encrypt my files into .kook extension.

I’ve tried so many ways but it seems useless

this is my personal ID
lDL3eVGxEeLPQzw0DWVuoZRGhKSoQZOXe0K9sVjs

and this is from the _Readme.Text from the ransomware sender
0243regyjnkjddrtlDL3eVGxEeLPQzw0DWVuoZRGhKSoQZOXe0K9sVjs

and this is his full message
ATTENTION!

Don’t worry, you can return all your files!
All your files like photos, databases, documents and other important are encrypted with strongest encryption and unique key.
The only method of recovering files is to purchase decrypt tool and unique key for you.
This software will decrypt all your encrypted files.
What guarantees you have?
You can send one of your encrypted file from your PC and we decrypt it for free.
But we can decrypt only 1 file for free. File must not contain valuable information.
You can get and look video overview decrypt tool:
https://we.tl/t-Q3NV26XcCT
Price of private key and decrypt software is $980.
Discount 50% available if you contact us first 72 hours, that’s price for you is $490.
Please note that you’ll never restore your data without payment.
Check your e-mail “Spam” or “Junk” folder if you don’t get answer more than 6 hours.

To get this software you need write on our e-mail:
helpmanager@mail.ch

Reserve e-mail address to contact us:
restoremanager@airmail.cc

Your personal ID:
0243regyjnkjddrtlDL3eVGxEeLPQzw0DWVuoZRGhKSoQZOXe0K9sVjs

if you are somehow able to decrypt it, please kindly inform me. I really need my data back. thanks

best regard from Indonesia