RickMace (nprofile…v958) on many clients you can also "subscribe/follow" to hashtags. From then on, your main stream will display all discoverable notes containing the followed hashtags, regardless if you follow a specific npub (entity like you which is producing notes on nostr).
Fyi: The magician behind Damus is jb55 (nprofile…9929)
I'm using as clients mainly Amethyst by Vitor Pamplona (nprofile…pyug), Primal Android and Web and some Nostros by KoalaSat (nprofile…jr69).