You need a replacement CPU.
You need a replacement CPU.
It's a 15-year-old socket chip. I'd advise against updating unless you're willing to invest in a budget system. Spending time and money on an update would likely not be worthwhile. But if you're committed, the top CPU choice for that socket seems to be the Core 2 Duo T7600.
Given the system's age, it's better to create a budget plan. A Ryzen 3200G based setup will meet your requirements.