TBH I would not be doing much at your gestation, to bring on labour as you are risking both yours and your baby's life. Though you can do things to help you with labour.
Evening Primrose Oil both orally and directly onto your cervix can help soften cervix for easy dilations
Rasberry Leaf tea this will not bring on labour, it just makes your uterus work better during labour, making for a faster labour.

When are you trying to bring labour on?