I don't like how unprocessed ore is more valuable than processed material. I think that ore should be a short route low profit commodity meant for newbies that can't afford lucrative cargoes yet. From mining field to local smelter, perhaps in the same system. On the other hand, processed commodities should be very expensive to buy, but also turn a good profit when sold. For example, buy a unit for 10K of today's credits, sell it for 15K at the other end of the map. Pirates will like this a lot because of the high base price.
I would also delete all money currently on the server, but of course, with a month's warning for players to prepare -- to either spend the money on what they've always wanted, or stockpile assets to sell them after the change if they wish to retain at least a small portion of their wealth. This will restart the economy. Call it an economic crisis due to warfare everywhere, have the warning appear in-game. With the help of this, I would also increase the value of the credit by 10 times, so a ship that now costs 2 mils would then cost 200K. Call it the new Sirius credit, founded after the old currency crashed. This should help with the money limit problem on characters.