You may see some improvement going to another 8 GB but not as noticeable going from an additional 8 to 16 for a total of 32. And unless you are doing video editing or intense graphic work another 8 GB or 16 will not be a must for gaming or everyday use. Also the performance increase you saw was also from going from single channel to dual channel RAM use. If you are going to add RAM then add 2 x 8 GB RAM modules so you can run in quad channel RAM configuration. So it may be wiser to wait until you have the funds to add 16 more GB of RAM. This web page may help offer some advice. At this point 16 GB is more than enough for average use and gaming but if you are determined you can go 32 GB to future proof the system.
I recently added a matching 8GB RAM stick with my current making it 16GB dual channel. I have a question that I'm getting conflicting answers to. Would adding another 8GB RAM stick greatly improve my performance? When I went from 8GB of RAM to 16GB it was such a huge improvement so I'm assuming another 8GB addition and I would definitely see a difference. I know getting two more 8GB RAM and making quad channel 32GB is ideal, but I just don't have the money for two RAM sticks at the moment.  Aurora R12 NVIDIA GeForce GTX 1660 SUPER 6GB GDDR6 1TB 7200RPM SATA 6Gb/s 11th Gen Intel Core i7 11700F (8-Core, 16MB Cache, 2.5GHz to 4.9GHz w/Intel Turbo Boost Max) 16GB, 2x8GB, DDR4, 3200MHz, XMP
RAM upgrade question.