Tips on how to level up crafting careers?

Hello! I'm 100hours in and I have managed to reach the last level in every fighting career. I would like to reach it for crafting ones, too. However, I have found that they're incredibly boring to farm. It is taking me so long to do so, I feel like I am doing things wrong. I have spent about 15hours trying to level up my careers and I'm only an expert in all of them.

Do you have any tips so this can be faster? I really like the game but the length is making me feel burnt out. Thank you!