That's because 95% of what Trump did was either illegal, corrupt, or went against the best interests of the American people. Trump had the least successful presidency of the past 100 years. There was little to be positive about.
The "fake new" crack is utter bullshit. Everything Trump called "fake news" was proven to be true. And as for "fake pressers" not once in his entire Presidency did Donald Trump every given an informational press conference to the American people.
Trump's interactions with the press were open attacks on the "enemies of the people". He attacked, denigrated, and tried to publicly humiliate members of the White House Press Corp - especially non-white women. He openly lied to the press and then became angry and combative when members of the press called him on his lies.
The conservative media can't get a foothold because MOST people don't want to be part of lies and complete dishonesty of the Trump Republican Party. Every attempt to create a conservative social media platform devolves in violent rhetoric, threats and hate speech.
Parler is shut down because it's not a viable platform. Violence, threat and hate speech are only popular in a small portion of the population.