Even though it’s been asked by countless thesis projects, it’s still a good question to look into.
However, are you looking in the right place? People have been personalizing the objects and experiences around them for a long long time, from their clothing to the shape of their heads, to how they want to leave this earth.
That is where I’d start at- the basic needs of living. Rich content there for the asking.
I’d suggest avoiding at first looking at the chunks of plastic that we carry around and the things we tap words into. I’m afraid that you will spend a huge amount of time and not find much useful to use as a designer.
My 2 cents.