What do you do to earn credits? I started taking skimmer missions again recently because they seemed to be the best paying option.
Luxury VIP passengers, 1st class VIP passengers, and certain missions, in certain systems - but I don’t share that info lest it be nerfed.
A good set of passengers, 3 at a time, nets me an average of 30m in about 35 minutes.
A good set of specific missions turns an average of 200m an hour. There are some very specific requirements to meet, and they tend to dry out before too long, so you’ll wind up moving around a good bit, but that’s sort of what this game is about after all.
My other source of solid income is a bit more risky, and takes a good bit of prep, but involves filling a Type-9 with rare commodities and hauling them to a few remote places. At 744 tons it takes quite while to fill, and it also requires the use of a Python to prime, as a few commodities are only found at outposts. So fill up on those, switch to the 9, fill up the rest and haul. Be ready for near endless interdiction attempts and profit to the point of nausea when done.