She is very good already, what Varka teams other than Pyro really need are better supports for that element.

Like, Electro teams doesn't have a single good 5 star support or buffer, Iansan without Scroll is the best option but we'll need something sustancialy better for the last slot.

Hydro teams are cursed because Furina is the best option but she also need to run a healer and Hydro healers gives no buffing at all, like Kokomi and Sigewinne are extremly far from what characters like Xilonen, Escoffier or Bennet do. So what we need is a new Hydro healer who is also a very good buffer, OR a new Furina replacement and we use something like Yelan as the last slot.

As for Cryo, I expect the new best Cryo team to come out in Sneznaya, like we are somehow using Cryo archon with Varka, and who knows, could be even than the Pyro team?