So, here’s something you can do during cbt if you’re not all that interested in capping right away. Stuff’s getting wiped after all 
The idea is that, at every rank (so this includes rank 1 before you ever even start the game), you throw every single class choice possible into a randomizer, and go with whatever comes out of it.
So at rank 4 wizard, you throw in wizard, pyro, cryo, linker, psycho, thaum and elementalist, and then hope for the best ;D
So far, I’ve gotten Wizard -> Cryo -> Linker -> Thaum.
Looks like RNG wants me to be a party supporter. Kinda crap to solo with though (until I get a higher swell arm, that attack bonus is love)
Personally I use a bot on Discord (chat program, like skype) called BooBot, which has a random choice built in. You can use this site to do it yourself: https://www.random.org/lists/