Sorry, I know very little about the rules under which the House and Senate operate. All I know is Harry Reid completely ignored them whenever he wanted to promote a leftist agenda. Republicans are putatively in charge; they can change the rules to get things done. But they have no desire or intention to shrink the beast.
As I understand it, the Constitution allows for the Senate to decide what the rules are that they will operate under. There are plenty of Senators from both parties who would vote against eliminating the filibuster rule. Just because you or I may not like it (at least while we hold the majority), the Senators have been elected and have the power to set their rules. And that's just what they've done.
But they have no desire or intention to shrink the beast.
It's been this way at least since the later 1800s, and the government is going to continue to get more intrusive. You might as well get used to it. It's sort of like me accepting that I'll get cold feet running around barefoot in my backyard in Minnesota in January. Wishing it was otherwise is a pointless exercise.
With Trump in office, he'll be able to accomplish some reduction in regulations, etc, but he's only in office for a relatively short time. If you want to learn more about the growth of government and why as a rule it just keeps growing, I'd recommend reading "Crisis and Leviathan" by Robert Higgs.