HELP! Any tips to kick start contraction?

Hi mumsies!! I am at 39weeks pregnant now and I still have not got any contraction. I am schedule for a c-section by KK hospital at 40weeks. I am trying and hoping to avoid a c-section again as my first born was a c-section and I do not want to go through it again. I have tried everything - going for walk, eat several dates per day, drink raspberry tea everyday and even go for prenatal massage and had a membrane sweep at week 38.. But nothings seems to work. Any help anyone? #Needadvice #secondtimemom