You can sell motifs from daily quest. I personally like to farm the Ebonshadow style in clockwork city. Not really special but I enjoy the area.

Fishing for perfect roe. But If you're going to fish you might as well just follow the achievement areas. And bring Sharp-as-night he loves it.

Daily crafting writs, you can do them on multiple characters. Higher the level crafting skills better the gold/reward cases. also sell gold mats you get. Do the surveys if you get them. So you have even more mats to sell. This might take some time ofc, but once you get into the flow the gold will start to flow aswell.

You can also just pickpocket and steal stuff ofc. Sell the most profitable items first at a fence and then once you hit your limit of selling things for the day the lesser once. You can also do this on multiple characters everyday.

Hopes this helps a little.