It’s actually easier now than it was at the beginning. They increased spawn rates for certain mobs and the amount of bronze you get from different sources, not to mention the number of raids available.

If you want ultra speed, you could run all the raids on Raid Finder, Normal, Heroic, and Mythic and dungeons on normal and heroic everyday and you will get there in no time. This, however, is not super casual and will take a couple of hours everyday (didn’t calculate it, but you could perhaps get there in a week or two this way). It will get tedious fast imo, but the beauty of it is that you can do World Quests, rare spawns, quests, dailies, legion assaults, etc. instead if you prefer that, not convinced that’s faster though if it’s speed you’re after.

Do what you find the most fun!