Try IdolWars then!!?, forget 10-50, U'll get 1000 gacha tickets within a month.
Getting SSR aren't that hard either.
And as long as you join the active Production,PvP arent that Bad.

Downside is, You cant get Seasonal Gacha character without being "Premium".Tho' they occasionally does gives Free seasonal ticket gacha.
But there's plenty of "Freemium" character & Event to amend for that.