While I get some server error please give me some tips how to level up faster..
And how not to get some Bad repairs >< .. It's so annoyin lol

Use your weapons skills to do more damage to enemies and take Yoshitsune along with you while you level to improve her to build relationship levels which will unlock better repairs and various weapon stuff.

Levelup faster? hmmm... You can try out party of 5 and do any grinding dungeon that suitable on you. More people much better but mobs become quite tough too.
leveling Yoshitsune until max level and that will help to reduce bad repair. Also, in smelting section theres one option something like DECREASE DURABILITY LOSS for 60%. Quite alot. so, why not give a try?

Thanks xD