Sometimes it helps to just get out of your comfort zone, it's hard, it's painful, and sometimes you end up just looking like an ass. You just grab a crazy thought and run with it. You don't necessarily have to fly off to Uruguay and drop off the face of the Earth, but just go out to a part of town you haven't been to, connect with an old friend, or go to some event you've never been to before. Take a pottery class, act in a play, go get food from a questionable, broken-down food truck in a shady part of town, write a shitty novel during NaNoWriMo, whatever. I find myself getting into ruts on occasion, where I'm almost too comfortable with life and it gets depressing somehow, it's hard getting out of it sometimes, but just getting into a novel situation can jumpstart something inside sometimes, just don't always go with the expectation of "finding someone". Loneliness is tough, but in a way it's freedom from constraints and responsibility.