I generally think of ideas relating to games, mostly because that is what I generally do. I think there are a lot of classic game ideas that could be brought up to speed, and a lot of new game ideas that could be reduced to increase casual popularity (think: battle royal games like pubg, dayz, which then translate to 2d games that can support large casual player bases).

I also had an idea of a platform to fight against the idea of scalping and ultimately give artists higher proceeds from ticket sales (though does not have to be restricted to concerts, think PS5 release type events as well), but I have not many insights in to the industry and am pretty comfortable at my day job for now. I think it could work because it would be possible to start small (do things that don't scale) but also eventually lead to a general system of handling ticketing and selling... but who am I kidding, I'll probably never do it :)