Future will be great. Hang tight, it's turbulence. Don't fall for the pessimism.
Mobile was an interesting curiosity that had piqued a lot of interest, but people didn't really know what to make of it. Same with cloud, which had just started with AWS. I remember folding up my casual game-creation startup (think Roblox on the web) in 2008 and thinking of my next move, and briefly thinking "Maybe I'll just go learn Android or iPhone development. Nah, I'd have to completely retool my skillset and I still don't see how something with such a small screen could be useful."
Electric cars are almost certainly not the equivalent today - everybody knows how and why you'd use an electric car, there's billions in capital going into the space, and all the major incumbents have electric car plans.
I'd bet on something like drones, 3D-printing, DeFi, multi-device ecosystems, robotics, or hardware. Look for something that people (particularly kids) are interested in; recently gotten cheap enough for hobbyists to play with it; there are lots of players in the market and few incumbents; limited regulatory barriers; and we don't really know what it's for yet.