You can only do 30 repeatable daily quests a day, but they get much better when you're higher level. Why bother wasting time with them? You're much better off following non-repeatable side quests and main quests. Low level repeatable quests are not cost-effective. Skip them entirely.
Monsters get really tough over time. The only way you can easily put up with them is by being as strong as that area allows. Most importantly, you can mix main mission quests with side quests, so you never have to backtrack after you get used to it.
From top to bottom, optional missions are sorted according to their difficulty level. Just like main missions. Whatever you're killing is a part of both mission types. All you have to do is kill more of what you already have to kill where you are. Comparing monster names with those described in the side quests' titles lets you never miss that opt-in bonus loot to upgrade your Constitution and Chi prowess.
Moreover, there are Mystery/Trial-type quests where you do a lot of walking. Since you're in that area already, you're better off getting it over with so you don't have to travel for hours to every previous area once you've reached maximum level. The map is your best friend - no guessing is involved when there's a purple marker you should be following.
Trials are weird. Sometimes markers aren't available - you have to look around to progress. Explore a little bit. It feels awkward because the game is automated most of the time. But it suddenly asks me to think - feels out of pace. If it were a boss fight, sure, but finding a NPC or completing parkour? Strange, but not a problem.
When the whole point of you running the game 24 hours a day is to make money, electricity takes its toll. When you're away from your computer, turn on energy saving mode. It'll stop using your video card and drop CPU usage for over 50% of what it was previously consuming. To top it off, when you exit this mode, you even get a report of what you've collected.
Activate energy savings mode by clicking on the battery icon on the left side of the ingame menu.
