Um, CA is losing a seat thanks to the census. Here is a complete list of which states are losing seats and which states are gaining seats: https://www.nytimes.com/interactive/2021/04/26/us/politics/congress-house-seats-census.html

The states gaining seats are overwhelmingly Republican. The states losing seats lean Democratic.

According to that map, it will take a miracle for Democrats to win the midterms.