Sex with your husband is the best-safest-most natural induction. Sperm on your cervex can get things going. Nipple stimulation, manual or using a breast pump, one side at a time for 10 minutes each side, 2-3 times a day, chiropractic or acupunture. Mainly you need to meditate, tell the little one you are ready when they are, welcome to the big world.
Remember babies get to pick their birthday. Your not going to get your body back for a long time anyway. Once the baby is on the outside, slings, nursing, car seats, dirty diapers, clothes- all things you don't have to worry about today. Your body is taking care of all of that.
I had to help my third come two weeks early to avoid my third c-sect. He was my tiniest baby- two weeks early and over 9 lbs. But he got here without any medical intervention.
Be patient. Some day soon you will look back on the beauty and peace of pregnacy.
p.s. I did do one dose of castor oil- it was horrible- terrible gas and diareha- never do castor oil unless you are already ripe otherwise you will just be sick and worn out when you go into labor.