@Albatross clicking on the second icon at the bottom of someone's toot (the quadrangle with the arrows pointing in opposite directions) is boosting a post. Boosting forwards a toot to the booster's followers and fellow instance members if they're watching the local (instance) feed.
@FrozenError If I learn through corrections of any updates to my proposed methods I'll forward them to you:
1. you can follow and be one of people listed in a directory on #hashtagged interests (check Settings)
2. https://communitywiki.org/trunk Trunk for the Fediverse categorizes interests and lists accounts by request
3. pinning a toot of your hashtagged interests to the profile and clicking on those on occasion will bring up recent toots, possibly those of newer accounts.
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko