You know your passion is mobile development If you ever tried, or even heard about Djinni (Dropbox's cross platform mobile c++ approach) - that's what I filled up my time back in 2016.
Since then my passion for tech stopped knowing any limits, and I've been exploring ever since. It didn't even stop at hardware. It was an addiction of buying newer and shinier Arduino boards until it culminated in me building my own electric skateboard.
I've tried AI, sound watermarking, reverse engineering, game development, emulator extensions, game engine tinkering, every single mobile sdk/framework/solution/architecture and I'm not stopping here, because the best things happen when your life long passion is your job.