Well, since you already went for cryo, then there a few possibilities. Keep in mind though that rerolling is much better early on, the further you progress, the more rerolling will hurt. I’m not saying you have to reroll though, there are a lot of ways this can be worked around.
Usually for PvP, cryo c3 is the go to choice because of the crowd control presented by Snow Rolling and Frost Pillar, since bloodletting from Plague Doctor seems to prevent freezing from affecting teamates, making you pretty much useless in PvP unless you also get psychokino for the PP + Ice Wall combo.
I tend to think that Thaumaturge works better with Pyromance and Chronomancer works better with Cryomancer. I say this because thauma makes your attacks hit for more, and since most of pyro’s skills are multihit, it increases it hit making it deal a lot more damage. In the other hand, cryo has a more supportive kit, with a focus on cc, which is enhanced by chrono’s supportive skils. I myself am leveling a cryo c3 > chrono c3 right now for full support.
So yeah, cryo chrono will most likely make you a better support wizard, while pyro thauma gives you more diversity, allowing you to deal a ton of damage thanks to transpose and bonuses to multihit.
Nothing stops you from going pyro chrono or cryo thauma though. Pyro chrono is favored by some people since stop doesn’t get removed by ground effects, such as flame ground, from what I read in this forum, and pass makes you able to spam a great deal of fireballs in a short amount of time. Cryo thauma seems less beneficial though, since I don’t see much synergy there.
My point is that picking either cryo or pyro has its merits, but the path you take later changes a lot. Cryo damage falls short mid to end game, while pyro can hold its ground until that point and can probably remain relevant thanks to thauma buffs. This makes cryo a more supportive role, while pyro focuses more on damage.
So yeah, what I think is that going for thauma c2 > chrono c2 is the detrimental part here. Go to c3 with either one, but picking them both will severly hinder what makes both the classes great (swell brain and pass).