For LC I recommend running the LC maps whenever they are in discount. You get 4 LC minimum for the higher level ones. Plus of course if you didnt clear it before, you get bunch of extras for 3 starring the map.
About a month ago, I had like 1500 LC left. And then I starter running these > just 3* them, not even like grinding the same thing over and over. With all the extras for map completion I am sitting somewhere around 6500 right now. A good use of those stamina pots if you want those goodies from the LC shop.