Democrats will have to run another Bill (not Hillery) Clinton or Obama. Everything you propose here is just preaching to the choir. The eight million Obama voters who sat this one out do not read Medium. The LGBTQ community is loud, rich, and controls the schools and media but are few in number, not many votes in that echo chamber.
No matter what Trump does in the next 4 years he can depend on the same 60 million voters next time. The Democrats have to motivate minority voters in the flyover states and not alienate any of the white Democrat voters there.