Former employee of mine had the 2019 MBP as well. After a few years he had the same problem with the fans -- if you haven't already, pop it open and clean the fans and vents. You'll probably need a little brush along with compressed air. Lots of stuff comes up on Google. Great machine btw. Good luck!

Thanks for this tip! The fans of mine have been spinning up regularly, especially noticeable when I upgraded to Tahoe a few days ago.