Have you ever repasted the CPU? The paste usually goes bad within 2-3 years, sometimes 4. Refer to this guide to remove the heatsink.
In addition to cleaning the paste, clean up the dust in the fan and heatsink fins. After a few years, the fans tend to clog up with dust and run slower. It may also be due to a bad heatsink, especially if a ULV machine like this is running hot - these shouldn’t get too hot even with a 7500U. It may be normal for it to run hot, as many laptops tend to run on the warm side with some being worse then others.
If that doesn’t help, there’s no way to replace the fans (even if you could, Lenovo PWM is temperamental if it even suspects a bad fan) so you’ll either have to live with it OR get a cooling pad.