generally, "all you need" is some wake scanner for wake scanning - you can do that while doing other stuff, or going to a busy station or tourist beacon. than go to high population systems in boom, scan nav beacon, and collect from high grade emission USS to trade in.
leaves you with raw materials ... anylanable with vulcanism and material polonium, map it with asurface scanner, go to the geo sites.
go to material traders to trade in.
but, as you have been to rohini, which is halfway to colonia, i'd say that will take you much longer, than doing the trip without engineering.
as
@tetra says, it's the permit blocking you.