Lenovo g5045 amd-a6 Why is the CPU hot?

Question

Lenovo

I bought a Lenovo g5045 amd-a6 in 2016 in 2018, it was under repair because the left or right bridge burned out, I don’t remember which one, the result is a year later, the processor heats up to 75c, tell me, is this normal? I changed the thermal paste a year ago, before that there was a gray thermal paste, I bought a white one in a jar and changed it. In games, I'm already silent boiling water! Is there an alternative to cool the processor down to 50-60s? during normal operation, I already bought two 8GB RAM sticks, the result is still the same lags as they were, but, because of 16GB of RAM, it noticeably became faster! Maybe buy a stand and open the back cover?

There is no desire to buy a new laptop, and this one will work in Photoshop and php programming ...

Now thermal paste HY410