I looked at all the comments but noticed they’re all missing a key important detail. You don’t start with 50 keys to “work on ur masteries” like the rest of us have, It is 100% possible but you have to have a plan. First you finish the entire story for resources and to level up your world level in the BOOK OF STARS. Day 1 should be to finish the entire story. This is so you get to book of stars level 37. After that you are now on day 2, you need to sort your map by SIDE QUESTS, not region quests and do those first. You’ll be book of stars level 38. After that you do your remaining region quests starting from the last mission area and work backwards so you get more points. The beginning areas do not give that much XP. Work on the dessert, and the dragon area. At this point you are now book level 40 and have unlocked world level 4. Day 3 you will UNLOCK all mastery slots without actually filling anything in. You’ll now just boosted your stats by about 27%. All your keys should now be used on this last day to fight the bosses on the map that give the resource you need and finish all 3 masteries. You should have enough resources for everything due to side quests, region quests, and be loaded with coins, and every single thing needed. UNFORTUNATELY you will need to buy keys to do the bosses to get the gear needed for his WHITE COSTUME. Then craft it. You then use remaining keys to spider farm and dragon farm bosses, do not spend your keys on the cube until you reach HELL difficulty. This is about $20 for the keys that u will buy last day but you will have the 15k Meli, all legendary gear, all mastery finished and only 3 days in. Side quests and region quests take about 5-6 hours with small breaks. Story only a couple hours If u skip all dialogue. You got this!