I hear you.
There is an asymmetry. You need a job. It’s your only job. They get hundreds of applications.
One adjustment I recommend is calibrating the amount of time you spend on an application. You shouldn’t be spending hours on a single cold application. Write your resume. See or hear of an opportunity. Send your standard resume and standard introduction. Hours of upfront work, but only a few minutes per application.
Focus on finding warming connections. The strength is in weak ties. Tell your family, friend, former coworker and update your linkedin.
Technical people are in huge demand. Given your skills you should have plenty of offers without much anxiety. You’ll get lots of non response. So it goes.
Good luck