Fortune box grind is playing the highest level boss you can defeat on auto play. Do this for all of your fuel 2-3 times a day.
the other thing to keep in mind is how many items you are upgrading. If you do one at a time all the way to maxed legendary sure it is painful but in a year you should get 3+ maxed items depending on how much you play. Start with torso and legs then do mods
if you are upgrading 10 items at once… you will have zero maxed items for two years 🤣.
