Arguably he's already done so much for billions of people. Had typing on computers not became the main way businesses communicate , anyone with bad, handwriting would be stuck in menial work.
When I was growing up in the 90s my hand writing was so bad it was assumed I would never amount to anything.
Then computers completely take over all aspects of business in the early 2000s. No one is writing TPS reports by hand.
All of a sudden my horrible handwriting doesn't matter. It's still really bad. But I've made 6 figures for well over a decade, along with an amazing year at about 200k.
None of this would of been possible without Gates. I also owe the creator of Android Andy Rubin. It's been a while ( and it might of been one of the other co founders), but I was able to thank Rubin. His response was something like "Well, we still need to get building applications working on Android."
I've also been able to thank( on this forum) Brendan Eich, the inventor of my first programming language, JavaScript. Amazingly humble for someone who helped create trillions in wealth.
Apart of me thinks Gates could still lead some innovation in computing. I hope somehow he's still coding under a pseudonym perhaps, and occasionally answering tech questions.
His gift to us has been this amazing industry.