Ye, it ain't easy to farm that gold.
If you have a bit of patience try to do this https://forums.warpp...et-like-a-boss/
Agitodesu and you yourself covered some specific ways pretty well explained. I'm just gonna share some overall thoughts I have on this.
So for me at least it's important that I first set a goal when I do anything anywhere. In this case that could be just to get a +20 weapon or anything, just a clear goal to work toward. I think it has to be something you can really see the progress toward, so like "I want to be op" wouldn't work for me because you can't really see how far in to that goal you are easily.
I'd try to find something to specialize on, and be very effective at that. This can be anything really, some specific dungeon or f1. That way you'll eventually be very fast at f1, or know the prices that items sell fast at from a dungeon. The most beneficial ways might require a little bit of wits and preparation to find, and probably aren't very known trough out the community. I feel that's the case in many MMOs.
But you also need to diversify of course, so mix in dailies and other dungeons. If you farm dungeons for example, having items from different dungeons can help you empty your market faster. Also do production when you afk and try to learn to resell stuff, as these are passive ways of earning gold and require little effort once you get the hang of them.
Always use your chances. For example events are often great for getting gold, especially if you keep the items for a while.
Also don't hesitate to get special or premium shops, especially if you start stacking up items to sell. That offline selling is very good.
So all in all you have to be efficient if you want to get gold fast, that's what it comes down to. Really depends on your personality though, how you like to play the game. If you want to chill and do stuff when you feel like it at the pace you want you can still get there. It'll take much longer, but you'll get there. Really, if you want to get a lot of stuff in the game, be prepared for a long trip anyway.