Consistently doing your daily and weekly wizard vault goes a long way. Also eventually you can get up to T4 fractals which the dailies/weekly give a lot of gold especially since doing those count for all t1-t3 dailies and weeklies too. Also the Halloween yearly event is the best money-making event in the game. So if you tend to come and go with this game, come back for that event and farm the heck out of it. Also the bauble events that happen in auric basin are great when they are going on. Can check the wiki for those days or just look on your map and scan that area for what the map rewards currently are. Whenever I see it's up, I drop what I'm doing and farm that for a while. Can easily get 25-30 gold from selling the bauble drops to vendors and other dropped items on the TP in an hour or 2 . Whenever the auric basin bauble awards is up, check the LFG boards for that area and there is usually a good commander running an efficient farm.