[once]

I think splitting up the large provinces, and by extension enabling a greater degree of legislative autonomy, would help Canada grow along more dimensions than just "east vs west" lines.

The US has 50 different state level experiments going on, and each is growing somewhat distinctly from each other. This allows people to rally behind the differences that they celebrate, and sell themselves more broadly to the rest of the country along these cultural lines.

Imagine Canada had 25 different provinces, each with it's own immigration quota, education system, health care, food traditions, landscapes & nature they sell.

Also I think we should do like Australia did, and hybridize our political system to give representation to each of these regions. Let the senate be elected and have representation form each region. That would help give each region a distinct political voice and would feed into the unique cultural characteristics of each place.