It was probably inevitable that the house would be lost since so many republican incumbents were quitting.
Look at Trumps campaign schedule and see who he campaigned for. Was it mostly for senators or for congressmen? A lot fewer senators to try and help compared to congress critters. Probably some RinO repubs did not want his help. Besides, Trump is a lot less likely to be impeached if the dems don’t control the senate. They can whine and bitch all they want.
And that is the silver lining, that the GOP got rid of a lot of deadwood.
The problem is that they still need to find good candidates to replace them, easier said than done.