There comes to a point when you have enough power that you should think about getting event ninjas. That happens when the amount of power gained for every coupon spent begins to decrease, which happens when the amount of items needed to level for power starts to increase (level 6 refinement, level 4-5 charms, etc.). The types of ninjas that are typically being used at the moment are ninjas that can control. Skillbroken kurenai is the best easily accessible option, especially for a wind main.

If you are a f2p, typically, lineups for fire main and wind main on average aren't f2p friendly as you need a lot of power in comparison with the average players you face and tend to use event ninjas in the lineups. As a wind main, some event ninjas you should save that can be pieced for would be shisui, jonin minato, masked man, red hot habanero (however, her usefulness will eventually stop). You can try for hokage minato but #1 he rarely shows up in events, #2 historically, most of the time you can get him only via ignots, which means you can't piece him via coupon, and #3 you can gamble for him in RNG events with coupons, but it isn't guaranteed to get him.

I am not gambling in "lucky wheels" because I don't trust them. I am lvl 75 and yeah, I almost reach that steps that stop me improve power like higher lvl in charm, refine etc. So I should focus on ninja now? I am not intend to stay on wind. I mean... I c*e every main acording to my ninjas. If I get mei and chojuro in kage treasure ofcourse I go on water main and so on

What's your power? Usually, you feel the decline of buying "power" near low 60ks. However, if your power is typically about the average 75-80, you can give up the potential power gained for saving up for a ninja.

I am lvl 75 and my power is 31k. I am second in power ranking

I would like to see the average the for lvl 75-80. (a f2p as well, lvl 77 and 50k pwr) And how is this even based? Because one of the players in my server cluster is lvl 78 and is almost 100k pwr and that would be a pretty big outlier would it not?

In my server there are not that kind of p2w. They pay but jsut a little bit. As I said, I am second in power ranking and the guy above me is like 33k. Only 2 k more than me. I am p2w but I only bought a medal and a monthly pack and untill now I didn't recharged anymore

Sorry didn't really define the average. It should be at least above 40k since I made *t to test what would happen to account that didn't spend anything on power and it managed to get to close to 40k by lvl 80. Of course the 100k is an outlier, not that hard to figure it out.

You could save but you don't have a large gap in terms of power so focus on power but don't spend a lot so that you have enough to save for a ninja.