It sounded like OP was saying they couldn't think of any interesting things to tinker with since everything they could think of is already a product on amazon. So in this case it isn't about alternatives to Arduino, it's about alternatives to reactive LED lights for your skis.
To your reply-writer, how do you think those products came to be, many of them are productization of hobbiest projects.
The arduino project jumpstarted a whole ecosystem, but I don't that ecosystem needs arduino anymore.