Local SEO in Vancouver is the work of getting your Google Business Profile, website and reviews into the map pack for the neighbourhoods and Lower Mainland municipalities you serve. Google says local results rest mainly on relevance, distance and prominence, so the setup has to match where your customers actually are.
The Lower Mainland is a set of separate cities that customers treat as separate places. Someone in Coquitlam looking for a dentist expects results near them, not across town in Kitsilano. Service areas, website pages and reviews should reflect the municipalities you really cover, and nothing beyond them, because listing places you never visit helps nobody.
Seasons and languages add two more layers. Wet winters change what people need from trades, summer brings visitors to tourism and hospitality businesses, and many customers search in Punjabi, Mandarin or Cantonese as well as English. A profile handles some of this well and some not at all, and it helps to know which is which.