Where to go from here gear-wise and where to farm/grind for silver/exp?

Currently level 54, will be 56 either tomorrow or tuesday.

http://imgur.com/VAyUm44

Will get the upgraded version of my chest at 56 ofc. My question ist now: What to focus on next? I find my AP to be kinda low, but I also know that <200 DP isnt much aswell. Exchanging Accessories? Getting armor to duo?

And also, where would be the best grinding spot to level to 56 and where to farm silver? Many would say Sausans I guess, but for some reason I find them to be kinda hard to solo and I take too much damage to upkeep the grind for hours. So yea, any recommendations?