Do you want to see more posts about interesting topics in your Home timeline? And do you want your own posts to be noticed by others?

Here's how to do both these things:

1. Search for a hashtag you're interested in
2. On the results page, click the + or Follow button in the top right corner
3. Posts with that tag will start appearing in your Home timeline
4. Follow lots more tags
5. Include hashtags in your own posts, tag followers will then see your posts

More info at https://fedi.tips/how-do-i-follow-hashtags-on-mastodon-and-the-fediverse/