Record the thing you keep saying โsomeone should buildโ. Tag it, timestamp it so itโs provably yours, and let others light it up, offer to help, or gently poke holes in it. No dead-end downvotes - just ideas and the people whoโll build them.
Friendly reminder: this is fun, not legal advice. In most of the world (UK, EU, Australia and more) publicly sharing an idea before filing can prevent a patent - if protection matters to you, talk to a professional first.