1. Regarding point one, Trump was impeached for trying to solicit foreign interference in the election by getting the Ukrainians to announce an investigation into Biden. He also obstructed the investigation into this by refusing to ignoring legal subpoenas for testimony and documents. He wasn't removed by the Senate who voted mostly along party lines. That's the way the system works to provide checks and balances on the President, that's not treason.
2. There was and is plenty of evidence that the Russians interfered in the 2016 election and Trump's actions were very suspicious. So, this led to a fully warranted investigation. Mueller didn't feel that there was enough evidence - and it was against their policies to indict a sitting President, however, he provided more than enough evidence that Congress could have and should have in my opinion impeached Trump for obstruction of justice regarding the Mueller investigation.
None of that is treason it's how our system works. Also your meme talks about "Terrorism", not treason.
3. Finally, there is no widespread evidence of voter fraud, there are allegations that have been rejected by the courts, even most recently by 3-Federal Judges who were all nominated by Republican Presidents, included one appointed by Trump himself. The claim that their is widespread voter fraud is a lie from Trump, and unless he provides any real evidence, should not be taken seriously.