In an election that will be close, and will have few independents, getting out the vote is very important. If you have a solid ground game, it can be done with volunteers, but Republicans do not have that. That means it will cost a fortune to get out the vote. Worse yet, Republicans will be trying to run it nationally, so will be unable to find any bargains.
Worse yet, trump will be driving many Republican voters to not want to vote. And many of the battleground contests have weird Republicans running in them.
Boebert got 51% of the vote, when people thought she was a good christian small business owner. Now that we all know she is a prostitute with Neo-Nazi leanings, it will be much harder to get her elected.