[Feature Request] Search via Instance X/universal search

(Hoping this post will finally make it throug now that federation issues are fixed) One of the main pain points of lemmy imo is that it is hard to find/be aware of communities your instance hasn't been connected to. In my previous app, Liftoff, I was kind of able to get around that by quickly switching to the default mode (basically guest mode for lemmy.world) and search for communities via lemmy.world, as that is one of the biggest and most well connected instances, and then subscribe via my regular account.

I wonder if there could be a way to implement something like that in Voyager. Voyager already has a guest mode that also defaults to lemmy.world, but it's not really easily accessible anymore once logged in. Being able to add a guest account to the switcher could be a quick way to make that a bit easier. Or maybe it would make more sense to add a "search via instance X" option to the search interface directly. There's also stuff like lemmyverse that aggregrates all instances and has an even more complete community search, but that would I assume be the most labour intensive way to implement a broader search feature like that.