How about doing action quests instead of time quests?

Looks like it's your first time doing Action Quests. You'll understand why they offer good rewards and why fewer people do them if you try them yourself. There are occasional Action Quests worth doing, though.

Time Quests just require you to fill the time, but Action Quests have objectives to complete... and reaching those objectives seems quite difficult.

I started a few of those action quests but couldn't finish them. If the game is really my type, I think I can do it.. But if I'm only playing for the gems, I tend to give up halfway through.

I think it's the difference between focus and neglect.