Laptop after 5-10 minutes slows down considerably. Any way I could speed it up again?

I have a Lenovo IdeaPad 3 15ADA05 with an AMD Ryzen 3 3250U and 4GB of RAM. For OS I'm using Windows 10. It's been my daily driver for about 4-5 years and I mainly use it to play games. Since mid-June to early July of this year I've started noticing that after a couple minutes of gaming it went from 50-60 fps to 5-10 fps. It can't be dust buildup because I cleaned it today and it has the same problem. Is there a way where I could get my fps back?