Great question! I would probably startup for an environment-friendly technology development, I would love to use all kinds of advancements towards a more eco-compatible future. I also just watched a Veritasium video () that REALLY made me think a lot. I would be very happy to also start a community to share knowledge and opportunities for free, aiming for the less privileged people. Hard work is important, and so is luck. People who aren't lucky should be given many opportunities too!
I would implement my idea for a greenhouse/ fresh market combination. Bottom floor is the fresh market while the food is grown on the upper floors. Different from the current vertical greenhouses in that it uses no electricity, only solar tunnels. No over-engineering. Just raspberry pi's, dirt, worms, and bees - and no pesticides!
#FeelFreeToStealThisIdea
I would invest in education and start a foundation to help underprivileged children access quality schooling, leading to a brighter future for many. Then, I'd treat my family to a well-deserved vacation to celebrate our good fortune.