Niagara Falls—Niagara-on-the-Lake is another close LPC-CPC race that could use any help from non-LPC voters. It used to be a CPC seat.
This page shows a nice visualization of the closest races.
Just for the record, I absolutely do not advocate for abstention. Voting is important, even in situations like mine. And I say this coming from a country where voting is a legal obligation.