What has the Outgoing Republican Congress Accomplished?

Republicans had an advantage in holding the House, Senate, and White House. These things don't occur very often. Granted, the GOP had a slim, troubled margin in the House, but there was unquestionably an opportunity to pass legislation and advance the ball down the political field to better position the base in the back-and-forth political game. So this brings up both a question and an opportunity to survey the performance review:

What has the outgoing Republican Congress accomplished?

and

Were there missed opportunities that the Republican Congress failed to capitalize on?

I'm wondering what others have in mind. Perhaps general or specific.

Milking the game analogy a bit more, I'm reminded of the phrase in sports that "you have to play to win". Frequently when a team sits on a lead and becomes complacent, falling back on defense while playing not to lose, it can cost the team everything. History tells us that Congress switches parties every so often—this seems to be a constant. What matters more, perhaps, is what lasting influence or legacy can be gleaned from those temporary Congresses. Too often it seems like the GOP under-delivers and the DNC over-delivers on core base interests. There's the old Mark Steyn line that went:

“When Democrats win, they’re in power; when Republicans win, they’re in office.”

Conservatives tend to desire a more limited, defined government. We're inclined to be suspicious of too much power in the hands of the government. A belief that if we act nice and appropriately, the other side will be honorable in returning the favor. But I think Republicans sometimes fall into that old joke that "the government that governs least, governs best." This isn't meant to be taken strictly literally. To govern, you still need to actually govern.

To do this, the GOP and its voter base need to be comfortable in exercising power while in office. Otherwise you are always playing defense and having to punt from your own goal line at inevitable possession changes. Much has been made of the presidency and Trump. The United States government still has a bicameral legislature, and perhaps that should not be forgotten. At the same time, it seems that individual Congressional members are taken as extensions of the president. Is all politics national now? I get the impression that more of the public fixates on national media stories—real or contrived—and misses out on local and state affairs.

So surely there's something positive to show, along with a fair heap of "what if" regrets. And hopefully we are not punting from under our own goalposts.