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Avocado Tree leaves black spots and turning yellow

Petty Guan
last year

Hi Everyone! Need some help on how to get my avocado tree healthy. I've had my wertz/little cado tree for 1.5 years. It is potted in a 20x20x12 planter and it gets about 8 hours of sun. I live in southern california. About 4 months ago i noticed a few leaves on the tree had black spots. Fast forward to today and it is on maybe 50 percent of the leaves now. I thought it might be pests so I have been spraying the leaves, but that hasnt done anything. Any ideas what is going on with my tree and what i can do to fix the issue? thank you!