Walk, squat, sex, drink coconut water, cranberry juice, eat dates, it helps for some not all. Try membrane sweep, it might trigger and cause waterbag burst. If this is the first baby, it will take pretty long. Based on my experience, both babies I exceed EDD and was at 3cm dilate until admission day. I had to ask doctor to burst waterbag in labour in order for contractions to happen. However, on both cases, my #1 did induce and was in labour more than 12 hrs. My #2 did not induce and was in labour more than 8 hrs. I had mild contractions before labour for my #2. Therefore I was only on oxytocin to have contractions closer in gaps.
Also a thing to take note, when contraction happens as it gets tense, pain, dilation will not happen fast therefore you have to know the right breathing technique and be calm. Not all has high tolerance level.
R