If you are using three 8GB RAM sticks this may contribute to the problem as it will force the RAM to run in single channel mode
vs higher performance dual channel mode. 2 or 4 sticks from matched kits of equal quantity, and exact same specs is best practice.
Try removing the extra 8GB to verify if this is the problem. Valorant probably uses less than 8GB including Windows functions on it's own.
16GB should be all the RAM you need for any game @1080p, unless you are heavy multi-tasking and have a lot of open Windows
in the background (an invitation to stutter) hogging your RAM.
.