u/Dismal-Bake-874

I made the mistake of not playing for like 2 or 3 weeks, I lost out on a lot of opportunities for gear but im getting back into it and have a lot of hero gear that is 1/6 and 0 crests to my name. I know doing tier 11 delves gets you i think 5 hero crests but that will take ages to get enough, whats the fastest most efficient way for grinding out crests?

So when midnight first dropped, I went on my main and did every single quest on the map, literally everything, I recently swapped classes though and want to main my new character, is there a way to get rid of every side quest and everything off the map of my new main without re doing them all?