Five steps from a problem to its solution.

Help me design and build a first working prototype for this problem in Punjab, India.

Problem: Small farmers in Punjab can't see how fast the water table under their fields is falling before they spend on a deeper borewell or another season of paddy.
Who it hurts: Small and marginal farmers in Punjab, many cultivating leased-in land, whose shallow tubewells are running dry while larger neighbours drill deeper.
The moment it hurts: When the tubewell stops yielding before sowing, and the choice is to borrow for a deeper bore, buy water from a neighbour, or change crops.
What people do today: Farmers decide on borewell depth and crops from what neighbours and drillers tell them; block-level groundwater ratings exist but say little about a single village or the cost of each option.
Why it is still unsolved: Groundwater data is published as block averages and assessment reports, not as advice for one field, and no one sets the cost of deepening against the returns of switching away from water-intensive crops for a small farmer.
What solved looks like: A Punjabi-language tool where a farmer enters their village and current tubewell depth, and sees the local water-table trend, the likely depth needed in a few years, and the cost and returns of deepening, buying water, or moving part of the land to less water-hungry crops or canal water.
Where: Punjab, India

First, list what you would need to learn from the people affected before building, as interview questions.
Then propose the simplest version that would help, the screens or messages it needs, and the data it would use.
Keep it cheap to run, accessible, and respectful of people's privacy. Flag anything you are unsure about instead of guessing.