I suspect Minnesota will be one of them.
Looking out as far as 2021, Alaska, Louisiana, Minnesota, Montana, North Carolina, Pennsylvania, Virginia, and West Virginia all have democrat or independent governors. A few of these would be tough, like Minnesota, but a lot are very winnable, especially if the democrats continue their self destruction. This would also eliminate a lot of potential national democrat candidates.
In the Minnesota senate, republicans are behind by only one seat, and are ahead in the house. Flip one senate seat and the governor, and suddenly Minnesota becomes a red state.