Nobody can really tell what’s going on with your attempts, yet ten years are a long time for showing no success from a number of projects. Maybe, just maybe, you are in love with the idea of “build a side-project, and passively make money of it” without fully practicing or proficiently practicing these well-defined (from startup or lifestyle manuals) number of plan + commercial + technical + communication steps needed to ship and sell competitive solutions? If the case, you might even reconsider some of your unsuccessful projects from the past ten years and give them a more focused go.