I've compiled from my experience what I think the best-return routines are, both for not-so-super-hardcore-but-still-want-to-compete players and the full on crazies.
The guide assumes level above 40 (since this is where the game really starts) with a Guild
The minimal viable routine
For those with limited time on weekdays (maybe also weekends) but still would like to not be left behind, total time is a bit over an hour per day, takes 3-4 weeks to reach level cap (45). The difference between the minimal and the complete routine would be the amount of gold/talent/gear accumulated and how soon reputation gear can be accessed, in terms of purely levelling there is probably only a ~20% difference.
Use up Stamina in Guild property levelling Life Skill ( <5 minutes )
3x Goblint Camp ( ~20 minutes )
20x Trial Quest ( ~20 minutes )
5x Irritable Elementals ( <10 minutes )
2x Elemental Leader ( <10 minutes )
Delivery Quest ( <5 minutes )
2x Reputation Quest ( ~10 minutes )
Hard mode Raid
The complete routine
For those who want to maximise gains and progress the fastest, it goes without saying you need to do everything and this list is more focused on the order of how you do it.
The 'full' routine can take anywhere from 4 to 12 hours, depending on how the runs go - so there is almost always something to do.
Use up Stamina in treasure chest hunting or life skill on world map
Reputation farm to limit ( Priority is Cudina first, then Lunarian )
2x Reputation Quest
3x Goblint Camp
1x Ancestral Altar
1x Dire Galleon
1x Scar Plains
Other dailys (delivery quest, elems, tournament etc)
80x Trial Quest
All daily events (demon invasion, protect relic etc)
All PvP scenarios
Any incomplete Hard Mode Raids
Any incomplete Team Raid
Any available map events (BBQ, protect the elems etc)
Original post is on the wiki here https://crusadersoflight.info/index.php/Levelling_routine, happy for contributors to discuss and make updates