Remove the roast from the pot and add in beef broth. Scrape up browned bits and return the roast to the pan. Add garlic, onion powder, and horseradish.
I went through many, many, Instant Pot recipes for a pot roast. I was looking for a good 'ole fashioned' one like what my parents were used to making in the slow-cooker. She's nailed the recipe and the instructions.