Why does the same resume sent to dozens of jobs get silence?

You call it bad luck. It is not luck. You wrote one resume and mailed it to fifty different jobs as if they were the same job. They are not the same job. Each posting names what it wants, plainly, and you answered none of them. A generic resume asks a stranger to do the matching for you — to see your scattered experience and guess how it fits their specific need. Strangers do not do this work. They move to the next name in the pile, the one that already speaks their language. This is not a flaw in you. It is a choice you have been making without noticing: quantity over fit, speed over care. Your pod can fix this faster than you can alone — another set of eyes catches what you no longer see in your own resume, because you have read it too many times.