What many people didn't know about this game is,you need 6 copies of the same unit to max break it until full.
in Global version they have to make do with SR +5 units and SSR Teze +2/3 to beat the Hard story mode and raids. That 5% SSR drop rates getting nerfed until 2% certainly has threw out the balance on how your team should be built.

I started Japanese version on last 20th May,just play casually and Nexon spoiled me like crazy on that server (so many freebies and rewards/5* weapons/Talent of Light/SSR select unit tickets).

Tried global version during official release,couldn't even last 1 hour of playing straight uninstalled. Everything was gated and felt very tedious to achieve unless you grind the game non stop using emulator overnight.

people on reddit and Discord said just give it time it's still new you can't expect to get full max ssr in 2 weeks blablabla. umm..no I disagree.
it's Nexon we're talking about I doubt this global game will even last for 2 years before they shut it down like others.