An appeal wins on one of two grounds, a factual error in the City's record of your property, wrong square footage, a garage that no longer exists, a basement recorded as developed when it is not, or a comparison showing your assessment is out of line with similar Lawson Heights homes that sold for less.
Pull your property report from the City of Saskatoon first and check the physical details, since a factual correction is the fastest and most reliable way to win, while a comparison argument takes more preparation and needs genuinely similar comparable sales rather than a single favourable listing.
File before the deadline printed on your notice, because the Board of Revision generally will not hear a late appeal. Get your hand-reviewed valuation from Joel Dyck.