Agreed. Understatement, even.
Assuming you bought this around a year ago, it might be time to add another 16 GB of memory to bring it up to 32 GB. In a perfect world, another two sticks exactly like the ones you already have. I bet they’re pretty cheap nowadays. (I just did this for $65.)
Also, you probably don’t even notice it, but if it were me I would absolutely replace that mechanical HDD with a 2.5" SSD. Noisy and slow, a spinning disc is a crime against a machine as nice as yours. It’s not even like it’s huge; it’s only 2 TB. But of course it would be a pointless upgrade if you don’t even notice the drawbacks of the mechanical hard drive. (If you didn’t until now but now you start noticing it, my apologies.) Figure a little over $200 either way (2.5" or M.2) if you wanted to.
EDIT: A cursory search of your ram suggests it might be in the $120 to $150 range depending on latency. (Or $90 if your RAM is CL 18, but I doubt that based on the rest of your machine. Should be at least CL 16.)