Q: How can I aim to still be objective if I have studied my own work?

Detailed Question -

I am presently working on my research proposal. My subject is English-Indonesia[n] subtitle[s] in TEDx video[s]. Originally, the video had/has only English subtitles, which I decided to translate into Indonesia[n]. Now, I want to do my research on the denotation and connotation and also the translation method of English and Indonesia[n] subtitles. However, my supervisor told me that it can[not] be objective as I [would have] studied my own work. So, how do I cope with this? How do I prove to people that I will/can be objective on my own work?

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