Whatever you need in a laptop replacement, there's a good chance you can find a device that meets those needs for under $300.
The Lenovo ThinkPad E16 Gen 1 laptop with 16GB of RAM is now 50% off from Lenovo for an $829 discount, but you're going to have to hurry with your purchase.
Asus's Republic of Gamers line comes in a variety of form factors with gamer-friendly features like hardware monitoring. Lenovo's Legion line and HP's Omen gaming laptops are also quite solid.