Faster / more is 2 different things. Somebody trying to game with a decent cpu/gpu and only 8Gb of ram will almost definitely benefit from using 16Gb, and removing the ram from any bottleneck situations.
Most games currently are averaging between 5Gb and 12Gb for 1080p/1440p, for total system usage, it's only when going heavy on the 4k that games will approach 16Gb. Some brand new releases like the new Starwars recommend 32Gb, for just that reason, it can hit 16Gb+ at 1440p with top line cpu/gpu and you'll want to keep the ram dual channel, 32Gb is the next step up from 16Gb.
For you, your pc is pretty average for a gaming pc, nothing over the top like a 10900k with RTX2080ti sli, so 16Gb is plenty for the foreseeable future.
It's not going to hurt to move upto 2666MHz or even 3200MHz, but you'd be looking at low single digit improvements to fps, which honestly don't make much, if any, difference.