i dont really know when you lost your data, but a few months ago they've added revival events, so you can replay events and get the cards you missed out on~
though they're really risky to play unless you have a sufficient amount of dia and a strong team. in revival events, points 5* cards go for 1,700,000points and ranking 5* cards go for as high as 12,000,000points depending on how high the ranking border was... pretty scary, but i'm pretty sure at least the points 5* is worth it lol
we have a section for events and such in this club, so don't worry about missing things~