You can make your posts much easier to discover in Mastodon searches by opting into "full text search". Once you've opted in, people will be able to search your public posts by any word or phrase in the post instead of just hashtags.
There's a guide to how to opt in here:
➡️ https://fedi.tips/how-do-i-opt-into-or-out-of-full-text-search-on-mastodon
The guide also answers lots of common questions about the full text search system 🙂