I only have Sherry and Marnie as shiny premium units and i spend 50 bucks to get the first, so please. U got clissa i got Marnie, now think about your luck. What u dont have on premium Units can be filled from trading post via spica and saki and event units. I keept playing instat of giving up and now i have, besides the standart Bashira, Spica, Cypria and Viera, an Rita, Imelia, Waltz and Memento put together with Marnie (free rolls) and Sherry (that i spend 50€ on) together with the free golds like iris, katie or cyrus from Trading post and u filled all the needs you can have. Besides an HA. The more often you remake an account the less event units u will have. So bad idea. Im level 154.
The only other golds i have worth mentioning are fedora, Mehlis and Zola. I did 30+ shrine pulls. 2 plats. All golds and silvers. My plat rate is below the 10% (6.6%) and my 90% chance for a black? Nope. Is my team bad? Hell no. Am i lucky? Hell no. Who cares. Luck doesnt change with switching Accounts. You can do what u want its your time but i wouldnt waste mine on resetting past level 100.
The game keeps on getting harder from here on, the more you take your sweet time the longer u will offset AWing. And no shiny blacks or plats from shrine will compensate you for not having your core leveled or AWed.