Some school districts even have early headstart, and you take them 4 hours a day. Early head start is for kids below 3 yo and head start Is for kids between 3 and 5
ChatGPT is so helpful. You can type in what you are looking for and use key words to narrow down your search as needed. I dropped a few links below that may be helpful for you.
https://chatgpt.com/?utm_source=google&utm_medium=paidsearch_brand&utm_campaign=DEPT_SEM_Google_Brand_Acquisition_NAMER_US_Consumer_CPA_BAU_Mix&utm_term=chatgpt&gad_source=1&gbraid=0AAAAA-IW-UXHNkl1Xhx1PE_OYJsXuBuHX
https://www.sandiegounified.org/enrollment/part-day_preschool_program/early_learning_online_application_resources
https://childcaresandiego.com
https://www.ymcasd.org/programs/child-care/preschool
https://www.neighborhoodhouse.org/nha-programs/head-start/
Have you tried the head start program