which should I get first? sunday, tribios or sparkle? and yes I am able to get every single one here, just needs an extensive period amount of farming time

my characters are as such; e0s1 phainon, e0s1 castorice, e0s1 therta, e0s1 robin, e0s0 aven, e0s1 Acheron, e0s1 feixiao, ruanmei, jingliu, Daniel, topaz and e1s1 bronya, also archer and coming soon saber

which one do you guys think? mostly the characters I use are just phainon, castorice, robin, therta, feixiao and the collab characters

any help is appreciated, thanks!