There are numerous way ingame to make money. With some alterations they have always been there. Before i go into detail i'd like to point something out though. If you made all the money for your fleet by running robigo runs then there might not be a real equivalent to that anywhere. Don't get me wrong, i really don't care how you spent your time ingame, but nearly all ways to make some money - next to running things where the hand-holding is being provided by ways of meta sources (go here, shoot 5 skimmers, this, that, done.) - would require some motivation to work stuff out. Absolutely fine if you can't be asked to, afraid i can't help in this case, except maybe with this:
People say there's good easy money in running massacre missions (numerous yt "guides" out there), i couldn't speak for that though. At best it seem temporary and might as well go the route that robigo, sothis/ceos took. But there's where i'd try for quick money.
As already suggested you could also figure out how the game mechanics help you finding your own fun way of getting some $.
Some suggestions:
different types of Passenger missions (long range pays best + explo data), your Asp, T6 would make quite capable long range passenger ships;
figuring out system states and how they influence each other (example: hauling medicine to a boom state sys. may not be grreat, how about an outbreak system instead, a t6 could easily make a few million/h just going point to point);
make sure you know how your standing with a minor faction influences the type and pay grade of a mission to get a grip on where to look for well paying runs and how a system type/status also has an influence on the missions available;
be aware of what you want to do with the money, or even after you got it, need engineering materials? you could combine your missions/trade runs with a station that *produces* the materials, no time wasted if you need the stuff later and you'd be doing it while making money;
*system-state *produces* the mats, example pharmaceutical isolators only in "outbreak" systems
how about a combination of rare trade routes in sync with passengers (there's many circle routes which you'd just need to slightly adjust to your passengers needs, usually not much time wasted compared to a basic rare trade run, in this case with a few mil. passenger fee's on top)
... and so on
Basically what i'm saying is this, decide if you want to keep asking for exact pointers - nothing wrong with it - or if you want to become apt in figuring stuff out for yourself with maybe a little help on how to get started. It would open the game for you in quite a bit different and maybe interesting way - than the "meta-pointing-help" could ever do. If you can't be asked: youtube -> "massacre missions".