Chrono - when things aren't going your way on a banner, don't feed it more. I've seen numerous people on here and reddit just drop insane resources chasing a particular unit (me and WoL for example). But the RNG just isn't giving it to them.
Live to fight another day. It could be that the rates on FFBE are bad for most, but good for you. There have been particular banners that have not been kind to me (WoL, Zidane. I think these units don't exist on "my" server), and some that have been incredibly good (Lightning, Refia banners).
If you continue to pull crap on this banner, better to fight another day. I will continue to pull this banner ( another Arc this morning) in the hopes of Luneth, but I'm never going all in. I will never own the PvP arena, but I can be competitive with my team. And seriously, the amount of units I need to level is scary BEFORE pulling anymore.