I speak Polish, German, Swedish and English. 3 of them are Germanic languages so they were easy to learn because they are so closely related. Polish and German I learned as a child so it was kind of automatic.
Now I have to learn Korean and struggle so much! After 3 months I have learned about 100 words. Any tips how to get to the first 1000 words Ina reasonable time? Especially in a language where none of the words seem to resamle anything from my previous languages.
This is exactly what I tell people who ask OP’s question. Technology made this a feasible approach. In the era of paper dictionaries it was a different story.