How can I improve my English through curiosity-driven learning?

I was raised in Asia and have been living in the UK for 4.5 years. I didn't study very hard when I was younger, so my English foundation isn't very strong. I think my English level is around B2. I can communicate with others without too much difficulty. However, I still have lots of room to improve.

I would like to learn English through topics I'm interested in, such as things I hear or read.

Does anyone have the same problem as me? How can I improve my English systematically through curiosity-driven learning?

Thank you!