Our users come from diverse worlds of their own. They come from diverse countries, cultures, and socio-economic realities.
The traditional UX tools like User Personas and Journey Maps may fail us here. Just for India, there would be 100's of personas. You can't just use demography, geography, etc. because they are not complete (eg: People from Mumbai & Sangli — two places in Maharashtra, India). Here are some mental models and tools I found useful.