Yes, though it's challenging if you have multiple passions that don't obviously connect or have a preexisting community, like mountain-climbing and knitting. If readers only have patience for one topic or the other, they get frustrated and leave and then you have an audience of zero. To be "successful," you either need separate platforms for mountain-climbing and knitting, or else you need to creatively brand yourself as The Mountain-Climbing Knitter and convince people you have a special perspective they should hear from. It's hard to make money if you're haphazardly putting out sometimes one thing, sometimes the other, whenever it strikes your passion and regardless of whether it strikes anyone else's. People get bored and don't want to put in the effort to figure out what the writer is doing when (given infinite free online content) they could just read someone more "legible" to them.