I can understand and speak Korean but not read or write

I’ve been watching Korean dramas since 14 years ago, and I’ve now come to the point where if I’m watching a Korean show without subtitles, I can understand 60-70% of it.

However, I’ve started learning Korean and I’ve found that it takes me really slow to read Korean, and I also roughly know how most vocabulary sound such that I’m able to understand and speak it, but I struggle with the romanisation and how to actually write it.

So in Duolingo, if you give me those matching card things I’m able to ace all of them because I can roughly make out the sound and match it to the word, but if you ask me to write a sentence, that’s where I struggle.

It’s quite frustrating because I feel like doing all the beginner lessons is too slow for me, and yet I still struggle in actually writing out vocabulary and reading it.

Is there any learning way you think might be best for me?