You are assuming the GOPe WANTS to keep the House. What they want is Trump gone, their Chinese paymasters protected from fair trade, and the borders kept wide open forever.
The RNC says it has increased the 2016 ground game by 4x.
Trump’s support has been successful in all but one special election and it has put his picks on the ballot after the primaries. Rallies planned in every vulnerable District.
IMO, most of our GOTV is being accomplished by the D’s behavior.
Hispanics back Trump 54% according to Quinnipiac, not a GOP poll.
Blacks back Trump 35% according to Rasmussan (no longer a GOP-owned polling company).
Voter ID in more states.
Arrests for illegal voting being publicized.
Illegals being deported.
If illegals are declining benefits in fear of never being able to apply for citizenship, will they risk voting?
Close special elections are not being decided by *found* ballots.(ex: Ohio)
Even for those who find Trump *offensive*, can they find Democrats attractive, given recent behavior?
All polls showing a blue wave to retake the House are eventually revealed to be full of sauce.