What's your power & how long have you played? If you are serious about playing, I would honestly recommend you change server toward a time zone that you can play & participate in those events, 9 Tails gives a lot of Sun Coins through out the week & GNW gives you your main source of Group Coins, both of which are really good for aquiring power early on, especially GNW which is a good source of Refines.

The biggest tips are honestly don't miss events, which means if possible- play daily, try & hold back on doing the story line missions as they give you more experience than you honestly need.

Save everything for rebates, save Charms for Charm Rebates, Refines for Refine Rebates & Seal Scrolls for Seal Scroll Rebates, you want to take advantage of rebates when you don't spend.

Save your coupons, a lot of new players fall in to the trap of spending their coupons as soon as they get them, on random stuff too, they'll spend a few on wheels to perhaps get lucky on a Ninja- I don't condemn it but it can be very much a huge waste of resource, save your Coupons for certain events such as Fukuromaru Deals as it allows you to spend a huge amount of Coupons for a huge rebate, which normally consists of a Ninja or abunch of power items- Doing this will allow you to also pick up usually unobtainable P2W ninja.
There's obviously out layers to this rule, a lot of people recommend things like Lucky Wheel early on as it can be a good source of power.
I'd also recommend saving & picking up Outfits early on as well, they're a very good source of power that doesn't diminish & eventually when you have the majority of the outfits you can focus else where.

There's a lot to this game, which means there's a lot I'm neglecting to say but I'm sure others will fill in the gaps & you'll learn the rest.
Watch videos on youtube- Btrue is who I watched early as he always explained events quite well but he doesn't do many videos anymore & Kaziers not to bad either.

I would change server at that level & power, I'd slow down on leveling so hard so you don't hit level 85 unless you're roughly 60-70k power.

Yes, obtaining some Outfit Fragments from Sakura Gift is fine- though there are Refines and such in there as well that you could go for- I'm not sure how the math works now with the rework of the event, I'm not sure if it's worth grabbing Refines anymore.

Here's a link to the server list, there are NY Servers & LA servers which are New York & Los Angeles in America, UK - United Kingdom, I'd say it's generally an English European server & then there is HK (Hong Kong) which encompasses Asia & Oceania.

https://naruto.oasgames.com/en/serverlist