Through my ignorance, I can think of a single election in the past 15 years where the left greatly exceeded expectations at the polls: Corbyn's Labour party in the UK. That was on a fairly progressive program. To a lesser extent, the recent French elections.Every single other election, it was left wing parties trying to pitch "no change reformism" to people violently voting for any kind of change at all, and then failing to grasp why they lose every single time.