Pretty simple actually.
Just make sure you don’t have any resource worth anything in the international market.

1. Let stuff like petroleum, Lithium, Uranium and other such thingies be sold to the first bidder.
2. Have your soil be nuclear contaminated, down to the bedrock, so nobody wants your land.

• Also, import all nuclear waste from other countries

3. Have a population that looks as ugly as possible, so noone will want to rape your people.

• Should be easier considering point 2
• Something like leprosy in the genitals would help too.

4. Be absolutely full of population, such that the place is a cesspool.

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Hey, I said it’d be simple, not that it would be easy or even humanly possible.