Trump will be the MOST IMPACTFUL President, probably of all time, especially if the Republicans manage to retain control of the House. If not, then his last two years will be totally compromised by partisan bullshit.
Trump sealed the border, thus at least delaying the Democrats' insidious conspiracy to steal all future national elections with third-world imports. He exposed our trading partners for abusing the U.S. mightily in international trade. He confronted NATO nations for abrogating their own responsibilities for self-defense, and forced them to Get Real. He jettisoned foolish environmental, regulatory, and anti-merit policies in the Federal government and the institutions it controls. He exposed the extent of massive internal fraud on the United States, reasonably estimated at half a trillion dollars per year in spending for (a) nothing, and (b) bullshit. He rejuvenated America's carbon fuels industries, making us the most productive energy-producing country in the world. He will presently rid the world of the cancer of Islamo-Fascist terrorism. He will be responsible for the "defeat" of China in the same way that Reagan brought about the fall of the Soviet Union. He has perfected the art of "transactional diplomacy," showing whole countries and regions that the best way to peace is through mutual accommodation, rather than diplomatic blather.
Compared to this, O'Bama and Clinton accomplished nothing, and Carter's accomplishments were actually negative.
FDR's supporters could claim that he was more - or just as - impactful, but his impacts were harmful to the nation, bringing about a virtual takeover of the country by a rogue Congress (and Supreme Court) that effectively neutered the Tenth Amendment. Essentially the entire Federal "Social Safety Net" is unconstitutional - completely outside the legitimate powers of Congress.
A hundred years from now, they will still be writing books about Trump's overwhelming influence on how the country operates and is governed.
Like it or not.