I used to reroll weekly like you, but I just got stuck to one class.
What helped me to stuck is doing bgs / arenas with friends and realising how fun the spec is.
about the arenas, people under 2k won't even see you fail, the skill gap in the ladder is so huge that a 2k rat like me can 1v2 most 1k rated comps. everything under 2k is full of backpedalers, people who don't even know what they're doing.
all in all, just try out the classes in arenas / bgs, don't mind losing because it's the only way of improving. (also no1 will talk smack about you at low cr, so don't worry about that)