Fishing, quests, coinpurses. That all is already there. If you farm some mobs or trade, etc, you can obtain gold. If rewards are exchanged to gold, there will be more gold in game but no items to by for gold.
Thats not true and I'll expain you why:
The problem is not by individuals but the new gold that is generated daily in the server. When new players joins the game, they generate some money by doing quest, but as soon as you reach max lvl, all quest you do are just dailies, wich the gold they provide to the server are minimal.
As for coinpurses, its the same, the bast majority of the playerbase don't open coinpurses, because the ratio of gold used per labor is to low, so no one will be using theyr labor for that = low new gold generated for the server.
The only players that open coinpurses are not players at all but bots, that for some reason they are always in the same spots in auroria and i have no clue why you don't ban them/stop them for comming back.
Fishing is garbage, to much time invested for low gold rewards (i know fishing will get a buff in the new patch, but if gold is not equal to the effort of being fishing, ppl will continue not doing it).
Trade runs might be the only solution for an influx of new gold, but since you can get more "gold previously generated" by choosing charcoal/gilda, ppl tends to pick that.
In conclusion, the more new gold generated in the server, the beter for the server will be, both for new and old players, because new players will get access to gear faster, and old players will be able to sell the stuff they have or the ayanad ppl is crafting.
Theres plenty of items in the game that are not being sold because theres no money to buy them, and more new gold will help to craft more stuff.
And this will also help the devs of the server, because the more gold there is, the more credits will be bought to buy said gold.
And ofc, as some one previously mentioned, stop adding items to loot boxes thatr affects craft. Its fine to have mounts/gliders/costumes and some random shit that can't be obtained by other means, but the sunpoint/moonpoint/etc... that goes in the boxes just destrois a what is suposed to be a "player driven economy".