Short term measure, as suggest by @nout, is to turn SN into a progressive web app and significantly overhaul the UI for mobile.
And there's a somewhat easy way to wrap progressive web app into Android App and put it on Play Store... so that would cover that :)
Just to reference here - I did a lo-fi mock for how could the mobile app look here: #19801 (with focus on mobile usability - i.e. making things reachable by thumb, etc)
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