Due to the way the Fediverse works, it's a good idea to have at least some followers (even a handful!) before you post interesting content. If you post stuff when you have literally zero followers, that content will usually not be visible outside your server, even if people follow you later.
There's more info on why this situation exists here:
https://fedi.tips/making-your-posts-visible-to-a-wider-audience-on-mastodon-and-the-fediverse
One workaround is to pin posts on your profile, pinned posts are visible to everyone:
https://fedi.tips/how-do-i-pin-my-posts-on-my-mastodon-profile
@FediTips Maybe this is an unpopular way of using social media, but I don’t like having followers. My timeline is really just a journal that I like to look back though occasionally, and if you want to see what I’m interested in and thinking about you can look at my profile and see. Too often people follow because of something I commented, but what I comment and what I post are completely different