Blacklisted and cannot do the work I am interested in before, What I should do?
Your current situation is troubling primarily due to non-academic aspects of your employment. You seem to be concerned mostly about academic factors, but let me try to refocus you on what is in my opinion more important: your safety and security.

You are in a foreign country (I presume), and you were forced into your current contract. You were in need of money and you signed an agreement which you find unfair and abusive. You feel insecure, you are not properly payed, and you are provided housing by your employer, whom you fully depend upon. This situation is short of what is known as modern slavery.

Academic aspects of your current situation are irrelevant and academic nature of your work is irrelevant too. Your current working arrangement falls short of basic requirements. While 350 EUR + housing may be appropriate level of pay in some third-world countries, the lack of security and forced nature of this arrangement are not acceptable. 

My advice would be to get out as soon as possible. Ask for help in the consulate of your own country, if you need money or legal protection to get out. 

When you are safe, please reflect on your experience and ask yourself a question: why do you want an academic work so much, that you agree to work in conditions which are worse compared to what you can get by doing a non-skilled work in your own country? What other (non-academic) career directions you can imagine for yourself and how could you learn more about these opportunities?