Just get respec potions and experiment. All the signs are viable, it's just down to which you prefer. Some prefer mind-controlling enemies with Axii, others enjoy slamming the whole enemy gang into the ground with Aard, while I like just spamming Quen and dodging.Does anyone use a sign build? The Griffin armour set seems all about making signs super awesome, but I can't figure out a good way to allocate points in that tree.
Also I told TrissWhere's she at?I love her and she said she was going to Kaer Morhen.
There's an odds and ends type merchant in the rich quarter of Novigrad who has respec potions, and also the druids on Skellige. I have 7 of them myself and have used 3, so they're plentiful and you can freely experiment with assigning points and creating a build you like.