Why wouldn't both sides want to settle the question with an investigation?
The only purpose for an "investigation" at this point if for Trump to use it as an excuse to overthrow the election and retain power until the "investigation" is complete. News flash, the "investigation" will take at least 10 years (because they really, really want to be sure) and in fact will probably need to take a couple of more decades as he hands emergency powers off to each of his kids by decree.
The place to prove your case is in a courtroom under the rigorous rules of evidence in a court of law. Not on Sean Hannity, not in the Epoch Times, not on internet forums.
You had 60 court appearances to make your case. Fail x 59. (One was a minor technicality issue that was non-material.) No believable evidence was produced of wide spread systemic fraud.
The states have had recounts and verifications.
The states have certified their results. Including states with Republican Govenors and Secretaries of State
The Electoral College has voted.
This election is over. Any attempt to derail results past this point is plain treason.
Have what ever congressional investigations you want over the coming years. You will get the same results. If you had any reasonable proof, any one of those Trump appointed judges would have take interest. There are always minor acts of fraud by stupid people in every election we've ever had. Usually local cases. Find those and prosecute them.
But the courts of this country have found that you have produced nothing that justifies delaying or altering the results of this election.