Upgrade advice

i feel like my cpu is getting older, and is needing an upgrade (intle core i7-7700) but i don’t know what cpu to get. I’m looking for a cpu that’s capable of playing modern titles like subnautica 2, perhaps gta6. Budget is around 300-400€ my setup: nvidia gtx 1080ti, 16gb ddr4, cpu mentioned, 1000w power supply. Also since the old cpu needed another sock i am aware that a new mobo may be required. I have been looking at the intel core i5-2600kf but i can’t decide. Also say if you think that any other component is worth an upgrade. Thanks for your time!💥