1st - Don't do RNG Events especially on wheels. If you have to only spend 200 coupons. Otherwise * to free draws.

2nd - Don't do sage or if you do leave sage after it starts so you don't feed.

3rd - Do rescue Jinchuriki for Charms.

Note: I did not see the first paragraph so you can ignore what I said and I'll leave it for those who might read it and might apply to them

If you haven't already, you could level freeze or at least slow down your level and focus on increasing your power. However, if you're at like lvl 90+ at below 55k and in terms of being competitive, you have no luck.

Since you made several mistakes while playing on this account, you could start new on a new server where you start brand new and begin knowing what and what not to do such as don't want to spend a lot on RNG events because you get peer pressured because someone spent little on those events, level freeze as soon as possible and work on increasing power, spending and saving seal scrolls on treasures you need the most, etc.

Advice after reading:

Like what InjunJoe said, at a certain point, you need to get at least event ninjas rather than power as spending on power will have diminishing returns since it gets harder to level. Get free frags such from events like Missions General (You could have got 10-11 free frags of minato jonin this week), lucky dice, limited recruitment, etc. Depending on what your server number, your power and level, there should be enough players where you can target and avoid fighting the stronger players. Don't be mad that there is someone that has more power but has lower level than you since there should be a lot more players that are weaker than you in terms of power and/or bad lineup.

Hello there fella. Like you, I also made lots of mistakes in my old account, some are irreversible that I already abandoned it. Im doing fine now with my current account, always placing 1st in SWB, winning in Matsuri etc. You are pretty powerful for your level in terms of BP. What is the problem? You lack better ninjas? You lack proper team composition? If so, please list your ninjas so that we can help you build a competitive line up. My advice is dont focus on power right now and instead save coupons to get better ninjas, not with rng events but where you can surely get them. My next advice, if there are so many powerful ninjas in your current bracket in SWB, level up and who knows, the higher bracket might not have that many powerful opponents. Power is not everything. Its only 50%, and the other 50% is your ninjas. I am lucky to get Shisui, and with him, I can beat a 15k higher bp than me.

Hello there fella. Like you, I also made lots of mistakes in my old account, some are irreversible that I already abandoned it. Im doing fine now with my current account, always placing 1st in SWB, winning in Matsuri etc. You are pretty powerful for your level in terms of BP. What is the problem? You lack better ninjas? You lack proper team composition? If so, please list your ninjas so that we can help you build a competitive line up. My advice is dont focus on power right now and instead save coupons to get better ninjas, not with rng events but where you can surely get them. My next advice, if there are so many powerful ninjas in your current bracket in SWB, level up and who knows, the higher bracket might not have that many powerful opponents. Power is not everything. Its only 50%, and the other 50% is your ninjas. I am lucky to get Shisui, and with him, I can beat a 15k higher bp than me.

Is this guy really complaining about lvl 89 at 93k power? There are people who are lower BP than you near your level.

Damage reductions and elemental resistance exists in Team Instance also.

Oh, and also as far as RNG events go this is my stance on that. I only take part in them if the redeemables are worth what I am spending (like getting charms packs, unbound runes, etc.) If the redeemables aren't really that worth it I might do one 10 spin, maybe two but I'm not going to spend thousands of coupons hoping to get something i probably won't get and then wish i saved those coupons the next week when a nice power items shows up that I need.

You will always be able to get those ninja slowly over time while compiling as much power as possible in the meantime. I am not a big spender at all but I have managed to reach 12th on S2. It just takes patience, perseverance, and a lot of discipline with your resources.