5 emails a week is only 260 a year. That's fewer companies than a single YC intake. I don't think it'd be hard to write a LinkedIn profile that matches positions at most startups (a few popular languages, interests in trendy tech, open to remote or in a popular location, senior skillset with lower years experience maybe indicating good-but-cheap). That would get you lots of recruitment attention. It doesn't mean anything is odd in the startup market (but obviously it doesn't mean everything is fine either, it just isn't a strong signal either way).