If I have done complete quantitative research, then complete qualitative research, then complete experimental research, and interpret all separately, then what will be my research design?
you have worked in exactly the reverse order . Unfortunately that is with most of new scholars and those seeking quick PhD or masters thesis .
here definitely egg comes before chicken. One has to start with finding research gap or research problem to be answered. Once this is set, you prepare a research design and tools you will need depending on type of questions and population used. The research methodology whether it will be quantitative or qualitative or empirical or phenomenology is picked . I suggest kindly rework step by step and logically. if you mention research problem statement and objectives , can guide much better
From your descriptions, I think you are doing an explanatory deductive mixed-methods approach. Why? It seems you are following QUAN - QUAL pattern. In other words, it seems you are drawn to test some hypothesis through any qualitative methods, I assume maybe an interview?
This particular case could mean that you are pursuing something novel to understand a ground-breaking phenomenon, based on the review of the literature?