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.
It's tough, you can vote strategically to make sure the party you want the least doesn't get in, or you can vote for the party that aligns with your ideals. I can't say there is a right or wrong way, but if you don't vote, that's how people like the Orange Cheeto down south gets in.