If I were to follow your activity, comments and posts, on Hacker News, I'd add the RSS feed https://hnrss.org/user?id=rolicia to Thunderbird.

If I wanted them separate:

- https://hnrss.org/submitted?id=rolicia (threads/posts/"stories")

- https://hnrss.org/threads?id=rolicia (comments/"threads")

I just posted detailed steps on how to set up something like this here: https://news.ycombinator.com/item?id=29697834 to follow certain keywords on comments or posts.

You can click on that link and see