I don't think you've failed. When I was at 55k power I was using a very weak team, FireMain, Mei, SageNaruto, and Iruka. I think you should stop developing your character with coupons and set a goal for a really strong team, try going into the arena and be inspired by any strong teams you see. Since you will be getting Hanzo, I could recommend you also get Shark Kisame they work really well together. I really powerful team I've seen that doesn't even need initiative that you could make would be Shark Kisame, Hanzo, Roshi, and Watermain. It's a combo team that gives several stacks of poison and ignition and it also has great defense and excellent control.