First and foremost, focus on getting your dungeon drops and THEN see what's left to grind.

For me, I did my daily expert, trial, and main scenario roulette first. After that, I'd do a few runs of Labyrinth of the Ancients--there was someone new every time, so that's 150 soldiery right there. I didn't think to do the early coil turns, but that's also a valid option as well as spamming trials.

So yeah, just alternate all of that and it shouldn't be too boring or tedious--when one method starts to get to you, switch to another. You have plenty of options.