Hi
Sorry but there’s not a lot we can do here as phones do heat up and some can’t play games as well when they heat up;(
The best recommendations here is to buy one of those gaming cases that have a cooler and a fan integrated into them
The best way I can describe the situation is like this
There is a steep hill and you are trying to put a go-cart up it when you need a car or a truck to get their effortlessly ,obviously the go cart is going to struggle
I also recommend getting a more modern phone (flagship) as they are better for gaming
Hopefully this answers your question
Thanks:-)