2011 v3 is still capable of some really good performance.
What is the rest of your build like at present? Is everything working well, or is there an app or game you want more out of?
Context is EVERYTHING in cases like this. Say you had a Xeon E5-1660v3, 16GB Quad Channel DDR3-1866, and a GeForce 780 3GB, and you were seeing poor performance in Control and Assassin's Creed Odyssey. In that case, spending a fortune on an i9-9900KS or 3900X would net you basically zilch for improvement unless you also paired it with a new GPU. And unless that GPU was at least a 2080 Super, you'd still see GPU bottlenecks with either the Socket 2011 build or a new Ryzen or i9 build.
CPU performance hasn't moved much per core in years. What has changed is better access to high core counts for consumer sockets. However, you are already on a socket that provides tons of cores, relatively cheap on the secondary market.
My gut is that your best economic use is to upgrade your existing setup depending on your needs, or basically a light rebuild depending on what you've got. Going to an nVME SSD, fresh W10 install (basically mandatory these days due to security unless you are willing to jump to Linux), and a fresh GPU if you game, and even a platform that has some years on it can feel like a brand new system.
However, all of this is hypothetical until we have more info.
At minimum we need :
What current
CPU
Mobo
Ram (and number of sticks)
HDDs, SSDs, and optical drive if any
Cooling, both CPU and case fans
Case
PSU
GPU
Monitor or Monitors
OS
List of apps and or games you have that run well
List of apps and or games you have that you'd like to run better
List of apps and or games you want to run or are considering in the future
And finally, the available budget for any potential new hardware