Further elaboration. If I use my Valiant design as a strong indication of what mid to late 21st century Earth ships were like then there’s my springboard for what mid 22nd century Earth combat ships could be like.
That said I don’t see period Earth combat ships being ringships. By this point I think rings have largely evolved into nacelles. A design I have from several years back could indicate how designs evolved—rings became multiple nacelles and cylindrical hulls sometimes became spherical in tandem with an engineering support cylinder hull aftward, and spheres evolved into saucers.
For a combat vessel I think the ships would be largely cylindrical for simplicity of mass construction. Not long after this era the spherical hulls would disappear.
Early to mid 22nd century Earth starship concept prior to and going into the Earth/Romulan War. In terms of large scale construction design would be simplified and perhaps more rudimentary and utilitarian. Pictured is a design for a deep space exploratory vessel.
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This happens to dovetail nicely with the Ceres-class from the ENT novels. It's a three-nacelled improvement over the Daedalus class. In the novels, it doesn't catch one because the workhorse Daedalus remain ship and easy to produce.