Is amaranth (rajgira) value addition like popping and laddoo worth doing myself?

Yes, the real margin in rajgira sits in the popped product, flour and laddoo rather than raw grain, and this value addition is doable at small and group scale because popping equipment and laddoo making are not very capital heavy compared to other processing. To do it well you need clean food grade grain, a popping method that gives good puff without burning, hygienic handling, packing, and for organised selling the right food licence like FSSAI. The fasting market gives steady demand for these products. The catch is that you need a market and a brand or steady local buyers, otherwise you make product you cannot move. For one small farmer the volumes may be low, so an SHG or FPO doing it together usually works better. Start small, sell locally, and scale once demand is proven. Confirm licensing before selling packed products.