There are many ways to find a mentor. First off your mentor should be your sponsor or co-sponsor as your success is their success.
If they are unresponsive then you can always add a a2a member who has found success over the years. You can check the growth tab where you congratulate members.
As others have pointed out you can always be your own mentor too as most affiliates will just refer you mostly to the resources already existing in SFI and the forums.