You have many other options besides CDA. You can conduct a sociolinguistic study focussing on social and cultural aspects ( taboos, euphemism, etc). You can also carry out a gender research oriented towards feminism. Think also of psychology / psychoanalysis and language, highlighting trauma, depression, etc, which the victims have to combat with. Best Wishes
Hi, Fatin Ilia Ahmat ! To analyse the language behind their reasoning for not reporting, I suggest doing interviews/focus groups among people who have been sexually harassed. It might be difficult to conduct a data collection that requires going to a field work, but perhaps there is a way you can do this virtually?
You can perform discourse analysis, and as you analyse your data, some themes will emerge. You can decide which aspect of language and linguistics to focus on from there. Perhaps narrative analysis if you do interviews/focus group discussions? That way, you can particularly look at their experiences and examine the factors that may influence their decision in not reporting their sexual harassment encounters.