I definitely think you write what you like, not what other say you should write, as a general rule, and as others have noted passive characters often work well (though they are usually paired with some much more active character that sweeps them along in their wake). That being said, if its a rut you would like to work yourself out of for your own sake, maybe you need to force yourself into it. Work a scenario where passive does not work, where the MC /has/ to be there driving force, or maybe one where the MC is the "a trained soldier or a hormone-pumping adolescent," a Man of Action, or overblown hothead, somebody that lends themselves to the driver's seat of the scene more innately. Find a story that forces you to kick yourself out of your comfort zone for its own sake. It doesnt have to be long, or complex or polished gold, just set out to write a few scenes that are as close to the polar opposite as what you are find yourself defaulting into. It might suck, but it would probably be a useful exercise