I'm stuck at lv.57 and feel that leveling by myself is very slow and becomes a burden, even with EXP boost on

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I have already done all the main quest story. Thanks to everyone helping. You're a big help !
Credits :
-> Hisashiburi -> thanks for the Cerberus bosses, Hades and all the help in Yakumo Temple and Sekigahara Battles

-> Deathy -> thanks for answering my questions and help once in a while
-> Hanzou -> Thanks for leveling up with me @SF, you're one of my best record ! 2 mins straight..or less?

-> Baby G1rl -> Thanks for leveling up with me @SF for a while ;p
-> Rhythm (Tentacle) & Ryxa -> Thanks for clearing Nyarluhotep
->Yui Hirasaka (Thanks for helping me from 2nd line to finishing story quest !)
-> kelgis -> thanks too

-> Kimmi -> thanks for helping level up with me at lower level ^_^
-> I forgot some names in the process, please ask me to credit you !