Should I Upgrade My PC or Buy a New One for Gaming?

It really depends on your budget and how much performance you want. If you're looking to spend around £800 to £1000, it might be better to buy new instead of upgrading. Your current components don't leave much room for upgrades, though you could potentially keep your RAM and maybe some other pieces like your case and power supply if they're in good shape.

Honestly, there's not much of an upgrade path with your current setup. The only significant upgrade would be a used i7 8700K, but it may not give you the longevity you're looking for. Reusing your RAM is a plus, since you're already on DDR4. If you're getting a new CPU and motherboard, you might want to look into AM4 options and a better GPU too.

Make sure your system meets the requirements! For example, Steam suggests a 64-bit processor and specifically mentions changing out the GPU to something like an AMD Radeon RX 6600XT or an NVIDIA RTX 3060 since your GTX 1060 is on the lower end for gaming now. You've got the RAM covered, but you might need to check if your BIOS needs an update for future components.