Ceanothus shrubs are very unpredictable. I would not have it pruned so severely, they require light yearly pruning. Once the branches harden and grow thick, they struggle to grow back
I am not terribly knowledgeable, but we heavily trimmed our Ceanothus a couple of years back from the bottom up actually from a large shrub to create a tree like specimen which is loved by the birds - its bloomed well and we just reshape it gently once a year.
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