Board Thread:Questions and Answers/@comment-27995643-20160830093404/@comment-27326537-20160830144033

From personal experience I suggest grinding at 4-4 until your swords reach around mid-50s to 60s, then power through World 5 to get to 5-4 which is where the bulk of your future grinding should take place. Alternatively you can try to level at the World 5 maps, but at level 40 there is a high risk of losing troops easily so I wouldn't recommend it...

Levelling your tantous and wakizashis for World 6 is a good move, but I'd prioritise levelling uchis/tachis/etc. first for now because when you unlock 6-1, you can use that map to level your tantous and wakis faster thanks to the exp and stat boost (so you can probably bring a tantou as low as mid-30s/40s? to the map).

Remember to return back to your citadel before hitting boss node if you don't want to trigger Kebiishi on your map. Also I wouldn't worry about World 7 at this point, it's still a long way to go ^^