I used to scroll through the streaming services and my Plex library to pick something to watch, but I ended up creating a Shortcut on iOS in an attempt to take myself out of the decision process. The manual process was not only not random, but there was still a lot of indecisiveness on my part that would make me waste time. So now I have a plaintext file filled with movie titles available to me, and whenever I want to watch something, I tell Siri to recommend me a movie, and the Shortcut app just picks a random title.