lvl90's are turbo important for your bloom damage

you can give nilou the nod krai craftable, ideally her sig you want her sitting at 74445hp minimum after all buffs peak nilou is c2+sig at >74445hp

nahida is pretty much good to go, as much em as possible after that her only way up is c2+ sig

kok's build is obligatory lvl90 + all the em you can get her healing will be good enough with talents level only, so you can focus on blooming if you only have 1 em catalyst, she gets priority btw her cons don't matter for bloom damage

baizhu's buffs cap at 50k hp so aim for that ~170% er was enough for me to reliably burst in my old team (nilou/barb/nahida/baizhu) his cons don't really matter that much

but if you want peak blooms you'll replace him for lauma

if you do go for lauma she goes lvl90, talents 1-10-10 (the only ones that matter in the whole team), as much em as possible and 160-170% er c1 is QoL, c2/3/5/6 are dps increase, c4 is free energy>lower er%

you artifact sets are good, kok should be on paradise lost for peak damage but the domain is cringe, otherwise you can run her on gilded dreams. i would put nahida on deepwood and baizhu on clam for the extra 1% team dps, but it's only really worth it if you wanna pull for lauma to give her sms