I tried castor oil it worked likea charm !
There's all these methods that kind of help but nothing will work unless baby is just ready.
With my son I used many things. I drank raspberry leaf tea, took evening primrose oil, ate a ton of pineapple, walked a lot, had sex...you name it. The only thing I didn't use was castor oil. I also had like 5 stretch and sweeps from my midwives and that didn't work!! He came 12 days late!!
But like I said....a lot of those things do help the process along the way!