You have to use hashtags on Mastodon if you want your messages to be seen because there is no AI to fill timelines. People follow hashtags and search for them. Then you'll get likes and boosts.
And, you control your own timeline by following hashtags, following people, and searching for hashtags. This way, unlike Twitter, your timeline only has posts that you are interested in. Once you get this set up, it's quite nice to only see posts that you like reading, without advertising and without posts meant to enrage you.