Have children would be the main one. Now I'm in my early 40s and still haven't had any yet, and it's starting to feel a bit late. I know it's technically still

Have children would be the main one. Now I'm in my early 40s and still haven't had any yet, and it's starting to feel a bit late. I know it's technically still possible for a while, but there starts being problems for men in their mid 40s, and also now I don't have quite the energy I would have had 10 years ago. Do everything I could to buy and hold bitcoin would be another one, and get used to buying stocks back then as well, also try to max out my 401k as often as possible. I dipped my toe into stocks and retirement then, but didn't really understand it or prioritize it enough then. Now I'm playing catch up. I think I'd also get into streaming on Twitch. Ten years ago it was still pretty early, and if I did that and stuck with it for years I bet I could have decently well with it back then, and built up an audience for the games and whatever else I worked on. Also it would have been easier to dedicate the necessary time to it. A lot harder to do that nowadays. For startup ideas, even though it already existed (founded May 2013 apparently), I think I'd have the best chance working on a competitor to something like Patreon. They went without any real competition for a long time, and their website never seemed all that complicated (creator page, sign up for a few different subscriptions, blog with membership tiers, I did pretty much all of that except taking money for my personal homepage I made in PHP 20 years ago) and seemed to barely evolve the entire time, so I bet I could take enough of a chunk out of it to make it worth my while.