First off, there needs to be an investigation of the US election process altogether from campaign funding to the actual mechanics of running them (e.g., gerrymandering).
Next, there needs to be an investigation of the Democratic Party and how they treated Bernie Sanders, which was the subject core to Russiagate. That was what all those hacked e-mails mentioned.
That leads into how did two of the most unpopular candidates ever get chosen to run for president?
A biggie is that there has to be an examination of the Electoral College, which was the real cause for Trump being President.
Finally, let's look into the misconduct of the press from the media blackout of a popular candidate to the pushing of a nonsensical foreign interference led to a Trump win (and why the fuck can't they shut up about it).
The bottom line is that Russiagate has been a big distraction from much more pressing problems.
See also: