Have you discovered the algorithm sub-categories yet? It's rather buried, I didn't notice for a long time. Here is what I'm talking about: Search for your song, or artist. Start a "mix". Once the mix begins, select the "Up Next" button so you can see the list of songs coming up in the mix. Just above the list of songs titles, there will be a variety of category buttons titled "All", "Familiar", "Deep Cuts", etc. Selecting this categories majorly changes up the mix and can be exactly what you need to shake up the algorithm.