RE: Out of Desperation I fell for this Exchange's fake promises

That's sad... I too can't afford $15K but in my society, if we knew a person is dying, someone will surely help them. (Not always as a charity. sometimes as a debt they have to pay in the long run.) My father's friend is still paying back the money his family borrowed for his Kidney's operations from years ago, but he's happy he's alive.

Sadly, I know not every society is like that...

I really don't know what you can do in that situation, but here are ideas:

Write high-quality posts on Hive, and tell at the end of each one that you need money for operations.
Ask for donations online, or do a Kickstarter/GoFundMe campaign. [Read THIS!]
Sell NFT art, even bad ones & say that you're selling them because you need money for the operation.
Ask people who have a lot of money in crypto, preferably people you interacted with before, to give you money. That might not work but it has higher chances of success than HYIP websites, like the one you posted about that stole money from you.
Ask people around you in your family/relatives/neighbors/their relatives/anyone to give you money. Tell them that you'll pay them back with online earnings if you have a plan. (Only if you have a plan!)
Make a reddit account, and go to /r/randomkindness page. Read the rules, it might take you a few days to get the requirements, but someone donated thousands of dollars there one time, won't hurt to try.

I know all of them might be impossible for you/your family, but think about why they're impossible, and what something you don't have now that won't be impossible if you had it... Sometimes, things that one idea requires can be acquired using another idea.

If you make it clear that you're dying by making an effort, taking pictures, (keep your privacy as much as possible but take pictures to make people know you're a real human being needing to be saved.)

There are many people online who will be glad to help people in need, but there are a lot of sob stories online. (sad stories like yours,) that scammers use to make people online sympathize with them.

That's why we have to have a doubt! We have to not believe your story until you give us the evidence. You can't save someone else if you don't protect yourself...

But you might be surprised if you opened up, gave people online evidence for your situation, of yourself. Made us know that you're real. People will help. At least, I can give you $5, and I don't give money easily...

You have a month right? Use it! I wish you good luck... !LUV