First off, there are sites like this one that claim to help you if you want to decrease the chances of a more right wing politician winng election in a specific riding: Strategic Voting 2019 Canadian Federal Election | don’t make a statement, make a difference.
You can use the site that way. But I’d argue you can use it another way. If you want to vote non-strategically, you can look at the site to see who is likely to win and then use that to vote for the party you prefer (assuming you are considering more than one). If you are unsure whether or not to vote NDP or Green, you might choose to vote Green and boost their vote count if you are pretty certain the NDP is going to win. Likewise, if you are a right of centre voter and you think there is either a strong chance or no chance the Conservatives will win, then you may feel more strongly to vote for the Conservatives.
Of course you don’t have to do any of those things. You can vote for your preferred party. You can vote for your preferred candidate. You can cast a protest vote for a more extreme party knowing it is unlikely they won’t win but as a way to indicate your displeasure. Vote how you think best. It is your vote, and you can use your vote to participate in the electoral process the best way you know how.