Only get one daily quest

No reason to concede before you draw, you might get a lucky break, but people should concede more often.

Just play a few turns and see how it's going.

If someone has you at 1 health with a full board and you have no minions, you wouldn't feel obliged to play it out, right?

If your draw is awful and they have great board presence after a turn or two, maybe no need to play out every excruciating turn there either.

There is a middle ground between conceding instantly and holding out hope until the very last moment of every game.

Some games swing back and forth, sure, but if you're trying to win as many games as possible in a limited amount of time, the key is to develop a sense of which games are worth playing for wins, and which games are best ended as soon as possible.

You can end up with any quest if you reroll, so if you have a 40 gold quest and reroll there is a chance to get a 60 or 100 gold quest. The higher value quests are rarer than the 40 gold quests though in my unscientific, personal observation.

This should also work the other way around, though I haven't checked this myself as I generally don't want to waste the 20 gold. So I would not reroll 60 gold quests unless you have no reasonable deck for the heros in question or simply don't enjoy playing them.