1. First completely distance yourselves from the national party
2. Focus on the local level first: so school boards, local DA, mayoral elections, city councils, county commissioners, and state legislature and start to build up the bench
3. For Gubernatorial elections run Kevin Falconer both in 2022 and 2026 in order to slowly increase the GOP numbers in statewide elections too but dont go all in one winning those. Just use those runs to help build up your ground game operations, moderinize the party, and create a new GOP image which should help in your goal for point two
4. At the local level having the gop come up with innovative conservative based solutions for issues such as housing, climate change , education , criminal justice reform etc
5. Once you do that the CA GOP should be ready to make a real comeback in the 2030s
But how do they do that? Even if Republicans somewhat recover in the suburbs post-Trump, the party's brand has become so toxic in most of the state.