Hell all, Currently facing an issue where I feel like my PC is not utilizing all my hardware Ryzen 7 3700 GTX1080Ti 32g Ram

All the sudden games started getting lower FPS, and we noticed the GPU was bottlenecking. Replaced thermal paste on CPU and GPU, and now the GPU runs at a good rate but the CPU is showing about 15% and Ram is only using about 8-9gigs. PC does show all 32g of usable ram. XMP is enabled All temps are normal. No dust build up in PC

Games - DayZ, Apex, EFT. Used to achieve around 100fps and now get around 60. Any ideas?