[spiffx]

After using InDesign CS6 for many years, (small-scale print/publishing), and trying Affinity Publisher for a time, I stumbled across VivaDesigner a while ago: https://viva.systems/designer/

I don't know how it compares to QuarkXpress, but it's a pretty good commercial replacement for InDesign / Publisher in my personal opinion: it has decent typography, styles, and good options for PDF/X-4 export (with FOGRA39 as a destination etc). I've also successfully imported .idml

They have various perpetual / subscription options (I'm on a commercial perpetual licence), a decent trial version, and they even do a Linux version, which works great for me on Mageia9.

I've contacted their support a few times, and they've been very responsive, professional and helpful, which was a pleasant surprise.