

If you go to the repository settings there’s an option to enable archived apps and outdated versions. Then select the f-droid archive repo for that app.
Often these are disabled for a reason, so you might want to check if there’s any important bug fixes since then.
There’s been people trying to push ⁂ as a way to represent the fediverse using a unicode symbol. I’m not sure it’s really taken off, but it’s an option.