PC noob here, looking to upgrade to Ryzen 9…

I’m looking to get a Ryzen 9 for streaming and gaming but apparently I would need a new motherboard, not sure the best steps…

Here is what I have:

CPU: 11th Gen Intel(R) Core(TM) i7-11700KF @ 3.60GHz

GPU: NVIDIA GeForce RTX 3070 Ti (temperature gets to 70°c but might just need cleaning out)

RAM: 32GB