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.