Quinte Fishing

I was catching a bunch of slabs in a little cove for the past week and yesterday the fishing was slow only one fish to show, which tells me they are moving somewhere else, in deep water most likely. what should i look for on my fish finder to relocate these fish? wanna get into them again and dont want to pack away the slab gear until next spring. any help will be appreciated.

PM me if youd like!