I would be better served if I quit my music addiction on proprietary YouTube. Some would be better served with a paper todo list than proprietary Google Tasks– which lost several of my todo items. Robinhood's users may have been better served not buying stocks at all. Almost all people are better served turning off proprietary ad software.
My point is– when proprietary software is so much "better", maybe we don't need to "replace" it, because while it has short-term benefits, it has negative consequences lurking beneath.
To directly address your argument, I think we need to come up business models that make free software just as profitable or more profitable than nonfree software.