I prefer one Wiki for both personal professional. But I’m a simple guy.
If I need a new “empty” for a specific occasion (a presentation and so on) but has my custom settings, I’ll dump all of the tiddlers using Advanced Search.
I save tiddlers as a JSON based on categories. One way to do that is to name it using the Query filter and using “-” in place of the “[]” etc. Might be something like: [search:tags[]prefix[202601-]] which becomes: search-tags--prefix-202601-.json.
If you need security, you can 7zip those tiddlers and put passwords on them. Another great use of TiddlyWiki is to have lists of the files that are hidden in your zip archives. A card catalogue of sorts: select the files in the folder and copy the path for all of them in one go. Paste them into a tiddler and away you go.
I’ve tried multiple Wikis, but lost track of where everything was. Maybe you have a way around this problem. But for me, TiddlyWiki is at the core of my whole life and has been for 10 years.
All of this may not be new to you. If it was not helpful, I apologize. My posts are targeted to like-minded simple uses for TiddlyWiki.
Have a nice day. Don’t fight and try not to get kicked.