I also used Logseq for a couple of years during my PostDoc and it is an excellent product. I also got into the habit of writing everything in the daily journal (with things like [[emacs]] in each top-level bullet so that I could read it under the Emacs page). I tried replicating this workflow in other system, including Obsidian and Org Roam and Denote which all support back links and journals – it works but it wasn’t as smooth as Logseq’s transclusion.
Currently, I’m using Howm, and am quite happy with that. Its motto is “write fragmentarily and read collectively”, which summarizes well what I liked about Logseq.
It’s however a slightly different workflow: I launch “howm-list-all” (I bind it to F12) to see a list of all notes, which I use similarly to Logseq’s journal. To read recent entries, use arrow keys or n/p to move between recent notes (which I use like top-level bullets in the Logseq journal), which are instantly previewed in a pane below. Or press “c” (create) to create a new note, which is automatically date stamped. Whenever I in Logseq would create a new top-level journal bullet, I in Howm create a new datestamped Org file. For sub-bullets I use Org outlining. But it largely has the same feel to me as Logseq’s journal system although it maps to different files on disk.
Instead of Logseq hashtags, I use Howm’s comefrom links. So say I am working on a project called “Foo Bar”. In Logseq, I’d type [[Foo Bar]] in my journal every time I think about that project. In Howm, I’d make a new note that contains a Howm link of the form “<<< Foo Bar”. Now, whenever I write the exact phrase “Foo Bar” (without any link syntax!) in another note, it automatically becomes a clickable link pointing to my Foo Bar page! I find this more efficient actually than Logseq’s approach since “typing the backlink instead of the link” feels like less cognitive overhead and less work. (Logseq has “unlinked mentions” but it somehow felt less reliable.)
Note that Howm supports any text format (it’s a minor mode), and thus doesn’t mind if you import your existing Logseq Markdown files but write new content in Org-mode, for example. It also supports searching multiple folders, so that you can link from new Howm notes to old Logseq notes without “importing” them.
I hope this helps, and would encourage you to give Howm a try. It doesn’t help with templates and queries, but as the sibling post touched upon you could try using org-capture for templates and either org-ql or org-super-agenda for queries. Howm and Org work well together, so there’s no reason you can’t use different packages to replace different parts of Logseq in Emacs. (Logseq itself is a great product, but I prefer Org-mode for the keybindings and export.)