Afinity Publisher is a good, affordable and a solid replacement for InDesign, at the price of MS Publisher.
We switched away from Creative Suite during one of the many “Adobe overstepping” debacles and haven’t looked back. Publisher 2 has felt like a drop in replacement for most documents/posters/newsletters/flyers etc.
I’m suggesting Afinity publisher because if you’re using ms publisher you don’t have qualms with closed source software and probably value some of the workflow niceties that come with commercially supported software.