A lot of tree trimming and removal. Lots of heavy equipment. Firebreaks a mile wide. More full-time Cal Fire people and equipment. Recycled 747s as water tankers (there's already one.) More underground power lines. Not really that hard.
Maybe drone fire surveillance and rapid response.
No, the solution is returning to the natural regular burns that are part of the ecosystem in California. Zero tolerance fire-fighting is the main issue at hand, as it builds up kindling to infernos.
And controlled burns. The land WILL burn - why would we NOT let it burn at a time of our choosing, such as the middle of the rainy season when we have the best control over it?
Those burns release a lot of pollution and CO2. I've always wondered if it was possible to collect the brush and dry plants and burn them more usefully for energy.