No way to tell.
If your games are fast action shooters, a stronger GTX1080ti will be an upgrade, but not that big of one.
If your games tend to mmo, sims or strategy games, you are likely more core speed limited.
Try this test:
Run YOUR games, but lower your resolution and eye candy.
If your FPS increases, it indicates that your cpu is strong enough to drive a better graphics configuration.
If your FPS stays the same, you are likely more cpu limited.
Considering the high cost of ram, I doubt a ram speed upgrade will be worth it.
Before you buy new ram, be very careful about ryzen ram compatibility.
Not all DDR4 ram will work.
You want documented ram compatibility. If you should ever have a problem, you want supported ram.
Otherwise, you risk a finger pointing battle between the ram and motherboard support sites, claiming "not my problem".
One place to check is your motherboards web site.
Look for the ram QVL list. It lists all of the ram kits that have been tested with that particular motherboard.
Sometimes the QVL list is not updated after the motherboard is released.
For more current info, go to a ram vendor's web site and access their ram selection configurator.
Enter your motherboard, and you will get a list of compatible ram kits.