Completely lost on where to upgrade my PC

Hello everyone,

I have had my pc for 5 or so years now and I am keen to upgrade but to be honest I don't know where to start looking. I am keen to game at the best resolution possible. I have around £600-£800 to spend and would love any info people have to offer.

My current specs are:

CPU: AMD Ryzen 5 3600

GPU: NVIDIA GeForce GTX 1660 SUPER

Motherboard: Prime B450 Plus

RAM: 32gb DDR4 (2x16gb)

Storage : 2 x 512gb SATA SSD

Monitor: BenQ EX2780Q

PSU: CORSAIR 550W CV SERIES™

Thanks in advance for an help and insight you can offer.