A check and balance has been on great display in recent weeks. A President has stated, "the election was a fraud, I should get another term". Congress has stated, "the election was correct. Moreover, we may choose to prevent you from holding office ever again." The judiciary agrees.
That Congress is likely to deadlock is arguably a feature, not a bug. (That voters don't demand better from their congresspeople is, perhaps, a correctable bug.).
There is only one exception to the amendability of the Constitution -- states cannot be deprived of equal suffrage in the Senate. See Article V.
The disproportionate representation is by design. Without it, the country literally would not have formed. I am pleased to see states hacking around it without an amendment, thus, should the prior function be required, the states themselves can revert.
Is adding states too easy? There are three million US citizens in Puerto Rico without representation in Congress.
I am hopeful that we will find ways forward on gerrymandering. The only true beneficiaries of the existing system are the political parties.
Impeachment is not just hypothetical. Though it was not fully realized against Nixon, it would have been had he not resigned.
Regarding the endless accretion of laws: we get the government for which we vote. Speaking up, as you have done here, is the first step toward making it better.