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Hello there! I have two thoughts on this. Remember that rankings are not static. You mention ranking positions for your core terms, but where are you standing when you do these searches? Searchers around Toronto and North York are going to see different local and localized organic results based on their proximity to the place of business at the time of search. From my locale in the US, you are #1 in the local pack and #11 organically for your Toronto keyword phrase. Are you noticing a drop in traffic, leads, phone calls, form submissions? Those are the metrics that are typically best to determine whether a business is falling off. Visibility is something that has to be judged in relationship to competitors. If your business is going down, others are moving up. The key is to find out what competitors are doing that might be causing the rise of their assets in juxtaposition to the the fall of yours. Here's a link to a tutorial on doing a basic local competitive audit: https://moz.com/blog/basic-local-competitive-audit. It's a few years old now, but the basic idea is to stack up your metrics against those of your top competitors and uncover the factors on which they are winning. Have you done some audits of this kind for your most important phrases? Hope this helps, and please let me know if you have any further questions.