Critically important discussion to get right, not a task i’d envy (that’s a big thank you for all involved taking this on)
Personal opinion from someone sitting very much on the fringe.
‘Libertarian Left’ - strongly support the last few posters, whilst accurately descriptive from the definition, this name doesn’t convey any sense of hope/change/progressiveness,
Both words (prior to engaging the brain to actually think about their definition) provide an instant and familiar association to ‘traditional’ political parties, status quo and even pro establishment.
A name association closer with global people driven protest movements isn’t such a bad idea but tricky as times change, a more generic approach might serve better over time with something along the lines of “People’s Progressive” (PPAU)