I got married at age 19 to a guy who only wanted to be career military. I had lived in the same house from the age of three and couldn't go anywhere in town without running into someone I knew. I graduated high school with folks I went to kindergarten with. The first duty station was very, very hard for me. We were there 18 months and I probably hated every minute of it. The second duty station was also difficult, especially at first. It took me some time to adapt. Eventually, I was more hot to trot to see what our next duty station would be than he was. But I was quite slow to adapt.
These days, my life is pretty portable. I don't own much stuff, my adult sons still live with me and none of us have plans to part ways any time soon, and a lot of my social activity and hobbies and such are online/on a computer. When I go someplace new, one of my biggest concerns is what is the food like and where can I get what I need in that regard? Some special items I order online. My ex husband was a gamer and when we first hit a new town one of the first things he did was try to find a gaming group in order to have a social outlet.
While I was still a military wife, when we moved, we would start making our "to see and do" list before we got to the new duty station and every long weekend was spent seeing local tourist stuff. I've read (and noticed) that a lot of folks don't go see local museums and the like but will travel elsewhere to go see stuff like that. I don't get that mentality.
You might try to figure out what you are "homesick" for. You might make a list of personal needs and what is being met and what isn't. You might try writing down what you expected of Cali and why you feel it isn't living up to those expectations. You might try setting a target date and decide that you will make a decision at that time and will just stay put until then and not decide before then (this last one is an approach that has stood me in good stead on many occasions).
I liked Cali when I was out there. But I had already made a few moves by then. We were in Cali the last two duty stations of our marriage and divorced out there. I was there about 7 years, part of it in Southern Cali and part in The Bay Area. But, again, our first duty station bombed with me and it took me several years to realize it wasn't Texas' fault that I was so miserable there and to finally "forgive" the state of Texas.
Good luck with this.