More people voting could have actually changed everything. I clicked through probably 2 dozen ridings on elections.on.ca > unofficial results and only 2 had a margin greater than ~7k and some were under 1k.

Mushkegowuk—James Bay has a margin of 4.

My own riding saw the NDP incumbent also win, but only by a margin of ~1600 while being one of the higher voter turnout outs of ~51%.