No, I have a lot of experience in liberal organizations and they are not, despite the memes, closer to conservatism than progressivism.

Perhaps if you redefine progressivism.

The major differences between a liberal and a social democrat or progressive comes down largely to deciding when a market has failed and when to use government intervention, both Liberals and progressives are fine with intervention, only the threshold changea. We want the same things, mostly, but disagree on how to get them.

Yep, you redefined it.

Conservatives, philosophical Conservatives anyway, won't typically even consider such a thing, and often do not even want the same things as Liberals or progressives.

Conservatives often do, and the distance between genuine progressivism and liberalism is shorter than liberalism and conservativism.

This both sides same stuff just hurts progressive causes, because it sours mushy people with little to no real philosophy on voting for liberal parties. Those people flip flop back to Conservatives when they get angry and we lose the progress we've made, as is about to happen in Canada.

Electoralism will not save you.