Here is the UC admit rate for 2021:
2021 Freshman admit rates for UC GPA of 3.80-4.19 capped weighted and not major specific:
UCB: 13%
UCLA: 4%
UCSD: 25%
UCSB: 25%
UCD: 44%
UCI: 16%
UCSC: 79%
UCR: 93%
UCM: 98%
UCSB would be a Reach school however, you have a valid reason for GPA decline which can be a positive in your application review. You have some good school acceptances so far and any of the other schools including UCSB would be icing on the cake.
Remember where you go for Undergrad will not define you, it is what you do with the opportunities you are given that will make you successful.