How do you think about your "friends"? Now we can't meet frequently because of COVID. Additionally we have a few things we like to discuss about ourselves. One of my friends moved and didn't let me know. Maybe she was concerned about interrupting my life. Or simply my letter maybe interrupted her life. I experienced this multiple times. Regardless, I would like to share things with my friends. Using "topics" here seems unnatural. Similarly, I would say "let me know" or "give me any warning" depending on what you mean. Good job!