Figure out what play style you like in general those with skill act boost are more valuable with exceptions
Camellia and Cymbidium best multi-hit
Peach, Oxalis, Epidendrum good single targets that are strong and bloomed
many 2 to 2 look for ones that have skill act boost
Pitahaya, Dahlia, and Greenbell(not bloomed yet) for debuff add some Cherry Sage and Paedaria for a solid debuff squad
Many decent counters, some have evade and counter like Snapdragon might make something with a team like that use Dianthus miko as a finisher
For whaleship get all the three hit non target types you can on the crew even if stats are a bit lower, they are best on the crystal
Kinda screwed on building a full Crit team without some 6* support but there are self crit girls like Apple, Epidendrum, can put with Nasturtium and Pitahaya maybe make something out of that and Formosan Cherry is coming tomorrow will be a good placeholder for 15% crit until you get a 6*
Solar not a big thing until Dogwood blooms and will be all 6* to be good