I apologize to not responding to comments earlier.
I had previously turned on comment moderation for posts older than 14 days in an attempt to control comment spam. But, I had not realized that applies even to past frequent commenters that I want to hear from.
It wasn't a problem when I posted frequently because I saw the comments awaiting moderation when I logged into Blogger.
Oops. I went 3 months without posting or noticing comments awaiting replies/answers to questions.
If you left a comment in limbo, I published and replied to them all.
Sorry and I set up email notifications of comments awaiting moderation so this doesn't happen again.