How can one get rid of the problem of parental pressure to complete a study that the questioner does not desire, and overcome the obstacle of scientific research in a specialization that he does not like?

We advise you to be keen on honoring your father and obeying him within the bounds of Islamic law, especially since you are in the final stage of your Master's degree and only the thesis remains. While it would have been permissible for you to discuss with him if you knew there was a better specialization, regarding the research topic and overcoming its obstacle, we advise you to consult with specialized professors and seek help from distinguished students. You can also ask your supervising professor.