The idea that "Trump lost the White House" isn't based on anything. Perhaps the Republican Party, and Republicans across the nation lost the White House by allowing changes to election laws, and failing to confront the media, Facebook, Twitter, and other tech giants that swayed the election and lead to the Biden administration, but that's not Donald Trump's fault.
The Georgia senate races were lost by candidates who didn't know how to win, and changes in election rules and procedures that the Republicans in Georgia never should have allowed to happen.
You can lay Georgia’s losses on Ratburger and Kemp.
The both got rolled by Stacy Abrams. And then changed the law now that they are up for election.