GRYFFINDOR: Hop on Nimbus 2000, cast "Aguamenti" a heroic and potentially effective number of times until suffering the effects of smoke inhalation, get rescued by friends.
HUFFLEPUFF: Check on friends and neighbors close to fire. Volunteer for group castings of "Accio Pluvia" and "Venit Inber" to bring rain, possibly "Defodio" firebreaks. Teach each other bubble charms for easier/safer breathing (also handy for airborne illness outbreaks).
RAVENCLAW: Read all 120 pages of thorough California governance report on Forest Management[0]. Try to organize herbology faculty, students, and community members into task force on controlled burns and forest restoration, begin research into long-term climate magic.
SLYTHERIN: Invest in private goblin enterprises specializing in lucrative airdrops of large amounts of fire-retardant potion. Circulate prospectus for wood-clearing companies. Talk angrily to anyone who will listen about how terrible political opponents are at fire management and how it just goes to show they should never be in charge.
[0] https://lhc.ca.gov/report/fire-mountain-rethinking-forest-ma...
(Please read the report!)
EDIT: can someone explain the downvotes here? Fire response/management and the politics surrounding it are going to be very relevant to the topic and an inevitable part of the discussion, and while I may have made some pop-culture whimsy a part of my comment, it's done hand-in-hand with serious observations about how politics play out, not to mention a link that contains a trove of essential solid information about policy considerations.