Thank you for sharing your rich experience of the Japanese culture, the joy, and... I'm glad you mentioned the sexist experience you had to go through with the older men in the bar. That is an important part and reveals the isolation of this culture and its implications like discrimination, sexism and biases. Something worth examining and rethinking.
I'm going to a 専門学校 for イラストレーション in Osaka and I think I gotta a find a バイト but I'm not sure what the best like job posting site there is. I don't think my school helps with that....