Some sort of medicine or ointment or balsam or whatever that halts hair growth. You decide your hair looks good right now at that length, and use this stuff to freeze its growth. It also protects your hair obviously so that it doesn't get weak and fall off.
Another thing I'd like is some sort of bath salt type thing that dissolves in water and painlessly removes all hair. You get in the tub with only your head above water, and then enjoy a smooth body without annoying-ass hair or annoying ass-hair.
Find a way to tie reproduction with the financial ability to support children. Fix society so successful people have lots of children as opposed to those on welfare.
"Uplifting" intelligent species through selective breeding and/or other techniques. Impractical? Yes. Probably not a good idea? You bet. However, I would really like for humanity to have sentient company.
I would buy the space next to the breakfast/lunch cafe in my neighborhood and make it a supper and drinks place that opened right when they close each day. Bribe whoever it is you have to to get a liquor license, hire a few people, pay really well, have no set menu but a supper service and then a few hours of drinks and small plates, close by midnight. Oh and a big cappuccino machine of course, coffee too.
I know this doesn't sound impossible but it's out of my reach and is what I'd do if we got a big windfall, like more than we need.
I’d start building O’Neill cylinders. Huge cylindrical lot extruded ring stations that simulate gravity for its occupants by rotating.
Becoming a spacefaring species is as good or better than becoming multiplanetary in terms of being able to survive impacts, and we can build these things close to Earth without transfer orbit scheduling constraints.
Obviously we should be pursuing both. But if I had the resources to do this, I’d start building the first human void city.
Participate in Eurovision I reconsidered after the terrible events of the edition that happened this year. And I had massive plans too. Who wouldn't wanna hear symphonic metal in this thing?
Also, as a Moroccan, representing Morocco would be the last thing I would do, even though they don't compete anymore, but still.
I'd develop a pickup truck that would have only the bare essential features and would be built from the ground up with the intention to make it extremely durable and easy to fix. Instead of a body-on-frame I'd probably go with a stainless steel exoskeleton instead and plastic/fibre glass panels you could just swap out to a new ones if you damage them. Kind of like on side-by-sides. The newer models then would just be ones with certain parts that have been upgraded to a better ones and would be 100% compatible with older models. You wouldn't ever need to buy a new truck again. Ideally there would be both diesel and electric versions - ideally so that you could convert one into another if you so desire.