For replies to my own comments, I use the "threads" link.
I use https://f5bot.com/ to get an email when one of my projects is mentioned here.
For tracking threads where I want to see every comment, I wrote a little tool called hacker-news-to-sqlite which I can run against a thread ID to populate a SQLite database with all of the replies. Then I can sort by created date descending to see the most recent at the top: https://datasette.io/tools/hacker-news-to-sqlite