The mobilization that started after losing the 1st round of the elections is something I’d never seen before in Brazil and something I think none of us could have expected. It gave me hope that not only we could turn things around but also that the left becomes more united in the future, because we’re definitely gonna need it. If you’re not from Brazil and don’t really understand the effort that went behind the left finally dominating social media, this article (in English) gives a good overview imo https://www.bbc.com/news/articles/cwz0vg4v3ndeo