Well, it doesn’t actually run at native 4K and the graphics settings are nowhere near Ultra on Series X.
If you want Native 4K and Ultra settings, you’re going to need a PC with hardware released in the last couple years - that isn’t a laptop.
I can honestly tell you that your performance is limited not just by hardware performance, but ultimately - thermals. Laptops use ultra-low power versions of their desktop counterparts and as such, cooling is severely small making them much more prone to thermal throttling. Even with fans running at 100%, that CPU and GPU is just slogging through 90+c temps.
Also, a 1660Ti is not meant to be used for 4K gaming. Its essentially a weaker 2060 without the RT cores which many agree that its a budget 1080p card.
Its a bit weird to run 4K native resolution and downscale to 50%… you’re literally running at or just above 1440p. And without knowing HOW that scaling is performed (either by pixel, or integer or otherwise) you could be using way more processing power than if you’re just running native 1080 or 1440 at 100% scaling.
I guarantee you that if you set resolution to 1080P alone and touch nothing else, you’ll see a bit of a gain in FPS. Even more so if you use graphics preset closer to match the capabilities of the 1660Ti which is around Medium.