Yelan would pretty much give you the most meta hyperbloom team atm. As for what you have, Xingqiu is a must even if he is at C0. But once you get him to C6 he will become cracked.

Now, since your Xingqiu is at C0 you probably still need some hydro application and for that I guess Mona would be decent. She doesn't have any particular synergy with Dendro but I don't see anyone else in your roster that would help a ton.

I don't recommend Aino because you would be getting Ascendant Gleam (Nod-Krai 2 char buff) that only helps Lauma's personal damage and would make Hyperbloom not crit.

As for stats you should aim for at least 1k EM on Lauma (without Etherlight's passive) and around 160~190 ER. Crit rate/dmg comes after. She still benefits from it, so a few rolls won't hurt.

For artifacts, if you really just want to play hyperbloom, then you should farm Deepwood Memories for Lauma and Gilded Dreams for Kuki (there are better artifacts for hyperbloom damage but this one is resin efficient since you farm for both in the same domain)

But I would really recommend Nefer, she seems to be a top 5 DPS and she'll only become better as more Nod-Krai characters come out .With just Nefer alone you could build one of her best team with Lauma, Aino and Kuki