SDSU is an impacted campus, admits by major and Psychology is one of the most applied/popular majors. With a 4917 applicants for Psych and 1833 admitted, this results in a 37% acceptance rate. OP’s GPA is above the overall admitted GPA for SDSU and is highly competitive but I would only call it a safety if OP is within the local admission area for SDSU. Definitely a Target/Match school.
For UCSB, based on OP’s profile I believe would be probably closer to a Match than a Reach. Although 2020 admit data shows with a UC capped GPA of 4.2 or higher, there is a very high chance for admission (this is overall in-state, OOS and International) for CA applicants last year the overall admission rate for UCSB is 28%. You have to balance a low admission rate in a highly competitive CA pool with the competitive GPA so I would lean towards a Match/Target school.
2021 data that I have linked shows an average 4.24 UC GPA for admitted applicants.
https://bap.ucsb.edu/institutional-research/new-student-profiles/new-freshmen-profile
UCSB does not admit by Major to the College of Letters and Sciences. If OP was applying for Engineering, then it could be more in the Reach category.
I have been surprised by many admission decisions in the last few years so you never know but I believe UCSB is not a Reach. Again, I am not an AO and do not have access to the student’s application so chancing many times can be futile.