my DD3 didnt engage until labour started. my waters broke before labour and i had to just check for cord prolapse and be able to recognise the signs etc. i reckon if you havent already just get some quick tips in case you do have SROM etc.

once my waters broke my IM recommended walking up stairs etc to get her to come down. i didnt have stairs so made them with my other kids step stools

so yeah not engaging is totally normal. your body has gone through the process of labour and birth before by the sounds of it so it will do its thang even without bubs engaging.