This has been less easy since 2011 changes. My essay on this:
theglobeandmail.com/opinion/democr…
1. A secular shift in voting ideologies. We saw in 2015 and maybe 2019 that the left-leaning proportion may have risen from 60 to 65%. New, more educated generations voting more leftward could shift the dynamics eventually
It's not on platforms in 2019, and Canadians have generally been resistant to voting-system changes
1. Canada will probably become a stronger player on climate. Trudeau campaigned on a very ambitious climate policy and in practice all but dropped the "pipelines and oil" half of his party's platform; supporting parties will hold him to this