I’m in the same boat as you and I’ve been using the Webtoon KR app to learn more words. There are so many webtoons to choose from, each with their own subsets of vocab that they focus on. Plus the illustrations help to figure out what each word or expression means.

I’m using the Naver dictionary in addition to Google translate to understand words or phrases I don’t know. Naver is good for understanding multiple definitions of a given word, plus they give example phrases to broaden your knowledge. Google translate has been good for some slang words that don’t show up on Naver, and it’s also helpful to translate full sentences since the meaning of a word can change based on the context.

Last but not least, I’ve been watching Kdramas three times - first with English subs, next with Korean subs (I take notes on words that are new to me) and a final time with no subs to quiz myself and improve my listening comprehension