The loss of support from suburban women is what cost the Republicans the House in these last midterm elections.
Wrong. 30 Republican retirements is what lost the House.
Plus your President wasn't on the ballot.
Untrue. 29 Republicans incumbents were defeated by Democrats while 2 lost to Trump sycophants in the primary. Democrats took those seats.
Trump was indeed part of the election. A number of strong pro-Trump candidates lost statewide races or narrowly won. Chris Kobach lost the Governor's race in deep red Kansas. A pro-Trump candidate lost the Governor's race in Minnesota. Mark Sanford lost the primary to a strongly pro-Trump candidate in SC and Democrats took the seat.