Hrm, that’s tricky. I suffer from the same, if I knew how to overcome it I bet I’d play more 4X games.
Somehow it works for me here, I guess because I mostly play it in MP, and mostly async. Means I never spend more than a few minutes on a single match at a time.
If city building is also your thing, check out Against The Storm, a really clever roguelike take where you only spend 30-60 minutes or so on each village you build.