I brought redmi 9 prime green mint color for my mother.
It is the best phone under 10 thousand rupees, it has two variant 4 GB Ram and 64 GB ROM and the second one is 4 GB RAM and 128 GB ROM, so I brought 4 GB RAM and 128 GB variant. It has a Full HD display and an AI Quad camera setup as well as it is based on the Android 10 Operating System.
So I personally feel it fulfills all requirements under your budget.