GavinR

Np, glad to help.   If you're like me, you go for 32GB RAM rather than pruning apps and software usage down
 
Btw, if you have ANY software that you use loading off the HDD, it will feel sluiggish compared to Windows (which I assume is fully on the SSD).
 
I once used a SSD/HDD combo and had some startup programs installed on the HDD and they made Windows load slow.  Just an FYI.
 
Your rig shouldn't feel slow even if you';re bumping against the 16GB ceiling to be honest, may be something else.
 
I'd invest in full SSD to be honest.

Looks like you already have 3200MHz RAM according to the part number.  I would personally get another kit (2x8GB) of the same part number rather than buying all new 2x16 and then trying to sell these or go up to 48GB which is overkill. 
 
https://www.amazon.com/Corsair-Vengeance-3200MHz-Desktop-Memory/dp/B0143UM4TC/ref=sr_1_3?dchild=1&keywords=CMK16GX4M2B3200C16&qid=1585950033&sr=8-3
 
Your motherboard can handle all 4 sticks fine, and if 32GB isn't enough for you... what are you wanting to upgrade the RAM for anyway?  Do you need more or not sure if it's fast enough?
 
There are other areas to get more performance possibly, can you list your entire spec sheet?