Hey guys! My Arcanist hit lvl 30 and as I want to become a summoner I changed my class to Thaumaturge. Little did I know that I have to level up again

1. Do I have to do tons of sidequests in between class quests or is there a faster way to level?

2. Do I have to level the thaumaturge now or is it better to finish levelling one class and then switch to the other?


Thanks