Hello! It's really hard for us to give you advice without even knowing the theme of your videos.
Therefore, the main advice is - study your competitors. Don't copy other people's ideas, but try to adapt: popular formats to your style, viral content, hashtags, music, the author's interactions with the audience in the video or in the comments, and much more.
Earlier, it was recommended for you to use subtitles. You can intentionally make a mistake in a word to entice a user to write a comment pointing out the incorrect word. Or you can insert some jokes into the subtitles – this greatly increases the chance that the user will watch the video to the end or leave a comment.