The thing about making gil is patience and constant work. You need to save some time to farm gil every week, be patient, and not spend all the gil you make. As I said in a previous reply if I had made an effort to make gil this entire year I could have around 100M gil. You don't need to dedicate a large part of your playtime to making gil, you just need patience and constant work on it, and also self-control to not spend on glam.

People underestimate the amount of gil you get just by doing stuff that take no time and give a few thousand, for example, the zonureskin maps if you farm them every day and save a few to sell on the weekends (where most ppl want to do the maps, so higher demand) you will get about 50K per map, so since you can get 1 each day = 350K/week with 2~5 minutes of farm per day, 1.2M/month with NO effort (assuming you have any gatherer at lvl 80).

If you have the culinarian and a botanist at 80 you can get 1.6M every 16 days guaranteed from delivering HQ Cofee Biscuits for the levequest "A Cookie for your troubles" in the Crystarium. So basically about 3.2M every 32 days.

If you don't have any gatherer or crafting, the gil making is more limited but still possible. Current expansion group maps (Zonuresking for ShB) allways are good options for making good gil, especially if you sell the mats and split the gil with your group (I recommend going with your FC mates or ppl you trust for this). In ShB you could also do cluster farms for the 180 cluster bozja mount and sell it for 1~1.5M. It an 1~2h farm and the mount probably will rise in price in EW since less ppl will do bozja and even less bozja cluster farm.