I'm assuming, in Canada, that you have a cool season grass. I can't think of a warm season grass that would ever look like anything up there.

Mow: As tall as you can stand, preferably at least 3" tall. Always mulch mow with the bag off (if your mower allows), and do so when it's no taller than 4.5".

Water: Rarely. Once a month, perhaps, in cooler weather, once a week during the hottest part of summer (if yours gets that hot--mine does and we're almost the same latitude, give or take). Put down 1" at a time (a tuna can is 1" deep so that's a good guide).

Feed: According to bag instructions. If you aren't feeding the grass, you're starving it.