Yes - absolutely keep commenting and look at your comments as a gift. We only get an average of 2-3 comments per post here. Don't think twice about commenting without voting. I comment 30 times a day and only vote 15-20 - at least 3 on my own posts; so I do not upvote most posts I comment on. Don't worry and just say good engaging comments.

Here's more advice on an old post I wrote and I'm putting it into the post like I should have last night :)
Make Money Blogging on Steemit Top Tips and Checklist for Better Results!!