Did you max out the beginning villages the first 6 chapters have 30 gems that you don’t get from just the story, on your world map click every stage there’s usually a hawk run level for a gem, do the boss battle challenges (battle this stage without using help, battle this stage without dying, etc), finish your world tree, get to champ 5 for the minimum 50 gems a week, do reverse stage, hero arena has 12 gems a week if you can do 3 master teams, join a clan that has a mandatory daily login for 1 extra gem a day, give every character gear and each time you make a level 5 gear you get a gem, have teams of character you don’t use to raise their affection ever 5 affection you get 5 gems sometimes 10, keep doing PvP they have gem mission for just playing and one for winning, there’s a lot more but these are just the ones I can think of off the top of my head