Try keystoneJS, it doesn't have themes but the admin side is pretty solid.
Not sure why you're looking at headless CMSes if you want frontend and admin/dashboard.
Ghost is pretty good as a blogging platform and has theming support.
Thanks for suggestion. I tried keystoneJS too along with 20+ other cms solutions. Still these cannot impress me.
And all these conversation is about cms part only. There is the virtual dom, node_module folder, crypto mining, fatigue and other dark talks left to talk :D .
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