TIL that you can search your own posts by tag, even for tags that are not pinned tags. Just use https://cohost.org/${USERNAME}/tagged/${TAG}. I mean, you can actually use this for searching anyone else's posts by tag, too, but I was mostly interested in using this for my own profile.
For example https://cohost.org/Gabriella439/tagged/writing searches for all of my posts tagged with "#writing" even though that's not a pinned tag of mine
Maybe this was obvious to other people but it wasn't obvious to me until I clicked a non-pinned tag on my profile page and it filtered my profile by that tag.
