What is the make/model of your motherboard?
What are the rest of your parts?
What is your budget?
Most games are gpu limited.
Run this simple test:
Run YOUR games, but lower your resolution and eye candy.
This makes the graphics card loaf a bit.
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.
Yes, a i7-3770K would be a nice cpu upgrade.
But, they are not cheap, going for $140 or so on ebay.
For comparison, a i3-10100 sells for $110 and is a fair amount stronger.
Yes, you would need a $70 motherboard and perhaps $75 for a 2 x 8gb ddr4 ram kit.