I’m a big fan of Yanis Varoufakis, specifically his book “And the Weak Suffer What they Must?”. I haven’t read his new book “Technofeudalism” but it seems to be making an impact. You can find lots of interesting long-form videos of him on YouTube, not just on economics but also politics(he was an EU finance minister), and technology (he once worked at Valve, designing their community marketplace).
I haven’t fully come to a conclusion about Modern Monetary Theory, but I would recommend Stephanie Kelton, she’s serious and interesting.
I would also recommend Thomas Piketty’s books, hes the expert on modern inequality.
If those are too far left for you, then honestly Robert Reich isn’t so bad. His position is further left than every president in my lifetime, but that’s not saying too much. His plans to “save” capitalism are serious and technocratic, it would be great if they were implemented, but imo they dont solve the core problems of capitalism.