You can always change the processor, the amount of RAM and especially the HD.
For games, NVMe HD is always recommended, which are up to 10x faster than conventional SSD HD.
The RAM memory is also easily changeable, but if you already have 16GB or more, for now, I don't think you need more.
As for the processor, you would have to see what your motherboard supports, some notebooks can be upgraded, but this is an expensive upgrade that doesn't always pay off.