ye uhhhh hm... immerse...yourself... sorry i'm not necessarily the best person to come to about language specifically because i myself am kinda bad at learning other languages but i will say there's so much research about how immersion is the fastest way to learn! and i think you can simulate immersion pretty easily if you listen/watch media in the language you want to learn; for korean i'd recommend podcasts or youtubers. culture-wise aim for consuming content that isn't just tailored for an international audience, though that might definitely prove difficult at first. does this help? if you have more to ask feel very much free to dm though! :)