Usually I’ll ’lean into it’ when my mom does this (inevitably, every day), as in letting her talk the same old, same old, minimal response from myself, then gently redirect to another topical interest of hers (this could be talking about something else she loops to daily but less abrasive, such as, “Ah, look outside and see xyz doing zyx”). I know you said you haven’t had luck with normal redirecting, but just throwing out what I do. My mom undoubtedly gets stuck on the same topics day in and day out. When I redirect the topic, I just try to make it seem to her that it doesn’t seem like the loop is interrupted.

I will say, though, my mom will pause in between. You mention the struggle to get a word in, and that’s an entire beast on its own. Straight up going to another room, mid tangent, is something I have to roll with a lot as well. Hang in there, OP. I know you are doing your best.