Is it worth it to ceramic coat my car?

For most cars in the Central Valley, yes. Fresno and Clovis get a mix of sustained UV, triple-digit summers and airborne ag dust that ages clear coat faster than a milder climate would, and a coating takes that damage instead of your paint. It also helps at resale, because a five-year-old car with protected paint presents very differently to one that has been baking in the sun. Where it isn't worth it is on paint that is already heavily swirled or oxidised and isn't going to be corrected first. A coating locks in whatever is underneath it, so we'd rather tell you that up front than sell you one anyway.