if you're looking to link to only posts tagged a certain way by only one person, you can use USER.cohost.org/tagged/TAG and get a view of only that. so for example this is every piece of meme art i've posted https://pinballswizard.cohost.org/tagged/meme%20art
(sharing something off of that page dumps you to USER.cohost.org once you're done posting though which i am unsure if that is intended behavior?)