It's hard to know why your power is so low without being on your account, but for starters push power up in the top left. The things not listed on there that could help boost your power more are your summons/runes for them and eight inner gates. Other then that, it's hard to suggest anything without knowing what you don't know.

Thanks its the rune stones. I don't spend coupons on it i guess that's the problem. Also my tactics are pretty low but i don't really wanna save coupons just to buy those

I'm actually at around the same stage as you.

But I'm currently focusing more on ninja tools and Eight Gates chakra while saving up medium refines on the side. Those two things I find are the most accessible, especially since Eight Gates uses coins and you need a lot of those Eight Gates training points to get that four initiative chakras anyway.

I can ask you something? What are you using your coupons for? Are you saving up for ninjas like dp hidan, hanzo, nagato, etc.?

If you want to use your coupons for power, I recommend using it on lucky board.

Magatamas are fine for now but c*e work.

Refines definitely needs work for a level 86 that's a bit low.

What level is your group skill at? Group skill adds a hefty amount of power.

Have you done purification or runes stones?

Can't really tell since I am not in your account but you can click on the power option top left to see what you are really lacking.

I used to spend coupons on seal scrolls when i ran short. Im sometimes use them when doing nine tails to get the 25. Group skills are at level 45. And purification runes i don't really get those. I should use coins on 8 gates maybe that will help

Just as this guy said, I would totally agree with him. Those are the most important things for power.

Are you at max for group skills?

As for refining, you need to work on that as it definitely increases your power a lot and your initiative. BUT, it would be better if you save those refine runes and only use them when refine rebate arrives.

For purification runes, its quite a risky thing. It either increases or decreases your power. You'll need some luck for that but if you have tons of protection runes, I guess it'll be fine.

And yes, about 8 inner gates, have you been spending a lot on them? If you just started, you might wanna work on that. It helps to increase your power, especially if you get the yellow and red ones. For me, I'm spamming coins on 8 inner gates at the moment to get that initiative chakra.

Also, yes, click that power *on on top left to check which one you're lacking. That'll definitely help.