Time Quest Gems Decreasing or Slightly Increasing x2

My Time Quests mostly give 500 gems. It's good if it exceeds 1000, and sometimes it increases, but it feels less than before. As you continue playing the game, the gems from Time Quests decrease quickly. If you leave it for a day, the gems increase a little, making you think, 'Maybe I'll play a bit.' By the way, I'm curious about the placement suggesting to do Action Quests, but looking at the quest details, I don't feel like I can do them. I'm not good at posting and can't write long posts, and the gems are few, so is it difficult to continue playing the game as a way to earn rewards? I also write comments, but they're short. Saving gems is tough~~ I'll try my best to post my thoughts on the games I play when I feel like it.