There are many reasons for philosophy’s stagnation, though the dual influences of specialisation and commercialisation, in particular, have turned philosophy into something that scarcely resembles the discipline as it was practised by the likes of Aristotle, Spinoza or Nietzsche.A bit weird to use Nietzsche as an example here, considering that he had zero formal education in the discipline called "philosophy" and spent most of his life as a hermit writer with nearly-zero readers.
In any case, there is a ton of excellent philosophical work being done and put online today – it's just not accessible to the layman. Bob Brandom, for example, has a YouTube channel with hundreds of hours of video. Unfortunately, most of it is basically impenetrable to the average person.
https://www.youtube.com/@BobBrandomPitt
As someone that enjoyed my BA in Philosophy but nonetheless decided to not continue on to a PhD, I'm of two minds on the topic of philosophy popularization. On the one hand, it's actually somewhat a relief that there is no charlatan figure like Jordan Peterson or Sam Harris out there ruining the perception of the field. When you interact with bona fide academic philosophers, there is a feeling of professionalism that washes over you. It's a reassuring feeling and one I almost never get when reading pop-philosophy books.
At the same time, this lack of interest in the public sphere also means that there is rarely any pushback to dumb arguments. Stuff like effective altruism grows and becomes popular not because it's a better argument than the alternatives, but mostly because the people most qualified to critique it...simply aren't paying attention.
The same thing can be said for most controversial issues like abortion, gun control, etc. – the people most qualified to answer these nuanced questions are basically uninterested in doing so in a public forum, or aren't given the time and attention for doing so.