ooh yeah thaumaturge becomes black mage at level 30, which is extremely fun and good! i'm not too familiar with crystal because its a newer data center, but there's a discord dedicated to it here, i'm not sure if zalera has one... there's a lot to ffxiv so its hard to have a beginner's guide so to speak, but r/ffxiv's FAQ has some good info in it definitely! i'm not sure if you use twitter but xiv has a pretty active twitter community as well!