How to increase your fighter attack power?

For pvp or another thing increase your fighter attack power.How?There are some example:
-Skill:-Leadirshep LV1 -Request:level 7 ,55mp,70 sp
LV2 -Request:level 24,95mp,155 sp
LV 3-Request:level 51,220mp,310 sp








-Berserk Fighter:LV 1-Request:20level,20mp,37sp
LV 2-Request:31level,30mp,59sp
LV 3-Request:43level,40mp,130sp




Items:Riffers potion have the faculty to increase your attack's power
Armor:lapised the armors with craft,dual craft,assault and deceive.

Whatch the video how increase my power with few things: