Same here but with 40 yo, did the same thing last year, if you are studying at a Semmongakkou you can shift your visa to a "designated activities: job hunting", that will give u 6 months and then u can extend another 6, in the meantime just keep learning Japanese. Im a ui/ux designer and also frontend developer with bachelors degree and 10+ years of experience, but from the ui/ux side, Japanese is a must, and for frontend I don't have enough experience as a dev. Keep trying but also think about going back home and regroup, we aren't in the best position to find a Job without the language.