IWTL How can I improve my English and become more knowledgeable?

I’ve been learning English for a while now. I can understand a lot of things, but sometimes I feel like I don’t know anything at all, especially when people talk fast or when the topic is something I’ve never learned about.

I want to get better at speaking too, without feeling stupid or searching for words every two seconds. I want to be someone who can actually talk about different topics. Some people seem to know a bit about everything, history, science, random facts, and I often feel like I have nothing interesting to say. I didn’t grow up reading much, so I feel like I missed a lot.

I don’t really know how to start fixing all of this. I want to learn more, but it’s hard to choose where to begin and I don’t want to give up after one week.

I’d really appreciate your advice. Anything about improving English when you’re already kind of good but not completely fluent, or how to build general knowledge step by step without feeling overwhelmed.

Thanks to anyone who replies.