What actually helped you expand your Arabic vocabulary?

I’m currently learning Arabic and I’m looking for way to learn new words fast and effective. Could you share apps/tools/websites that genuinely help expand vocabulary and make words actually stick long-term. Or any other ways I can expand my vocabulary.

Also — a while ago I saw someone on Reddit post a vocabulary-learning tool they built themselves, and it looked amazing, kind of minimalist/productivity-style, but I completely lost the post.