Quote From Costate:

Not to be critical, but it seems to me that you have not done enough ABCs about your work.

Try finding these highly-citied journal papers on your topic from top journals which have been published recently (e.g. within 3-10 years, depend on your area of research), and try reading them (especially the introduction parts of these papers) very carefully.

By doing this, you will get a good idea about whats going on there, and by then you should have already known the possible approaches to tackle the problems as well.

Btw, don't expect too much help from your supervisors, its too often that your supervisors basically have no idea about the topic you are doing (otherwise they wouldnt have been so keen to  pay you to do the work in the first place) and sometimes their "detailed" advices can be misleading (yes, it does happen, actually more often than you may think) which may even lead to potential viva disasters.

So just learn to work on your own and take "advices" from these highly-citied peer-reviewed journal papers, good luck.