Even at really social schools like SDSU and Chico, Covid put a real damper on the student experience. Since your complaint about CPP is primarily the social scene - which will be dramatically different with things reopening in the Fall, I’d suggest you head back and give it another shot. It will never be UCSB but, the fun quotient will certainly improve as clubs, fraternities, live music, etc begin to resurface.
There’s certainly no harm in applying elsewhere and seeing how it plays out.