Keep active, eat well to keep your energy levels up, keep hydrated and just see if things get some momentum. Walking around and (dare I say it) DTD both work wonders lol. DTD broke my waters with Eddy.
My advice is, while I know it's frustrating, try to enjoy this time. In a few days your whole world will be turned upside down so try to get out in the sunshine, spend some time with family and friends, and then when LO arrives you'll feel ready, re-charged and satisfied. I didn't do this with Earl (just sat around getting upset and frustrated) but when I went OD with Eddy we dropped Earl off with MIL and went out as a couple, long walks on an evening, trips to the seaside, all sorts. I went 10 days OD (dropped Earl off when I was 6days over) and the whole 3 days prior to him arriving I was getting contractions on and off. They're good, they're your baby and your body prepping to come out. You may be pleasantly surprised that you'll be a couple of cm dilated already when your labour eventually kicks off.