Could you please recommend some methods for studying Korean?

Question

Hello! I want to learn Korean, but I don't know how to start. I know the basics and have watched all 50 episodes of Billy's beginner course. However, I want to expand my vocabulary and grammar. Currently, I'm using Anki's core 5000 deck, but there are many words that don't suit me. For example, I don't really need words like '간질이다'. I want to create my own deck, but it takes too much time, and I'm not sure which words to add.

Also, I like the idea of using Anki connect for sentence/word mining, but I can't purchase Migaku, and Yomitan doesn't capture the words I want properly. As a foreigner, I find it hard to understand Korean speakers because they speak too quickly. The pronunciation of stress and aspirated sounds is particularly difficult. I know the differences, but it's hard to pronounce them correctly.

Do you have any suggestions or tools that could help me study Korean more effectively? I would appreciate it if you could share any resources or tips available to foreigners in Seoul.