There's a lot of different "ways" to naturally but it doesn't mean it will work. My doctor advised me nipple stimulation and sex. He said the drinking of the oil, tea, walking, etc has a very low percentage rate of working.
Medically, they can do a membrane sweep or do a check that involves stretching out the vagina.
I'm 38 weeks today(its 2am) and I read that nipple stimulation(you can google how to do it.) works. Its proven to work on some women and some doctors even have you try it. Walking a lot has helped people I know go into labor, so I'm starting that. Someone told me swaying their hips also helped get the baby into position. Just google natural ways to induce labor. (: But I know some have tried every idea in the book and still had to be induced. I REALLY don't wanna be induced, but I guess if it happens, it was meant to be that way. (: