XPS 15 9570, 2TB SSD upgrade

Any PCIe 3x4 drive will do fine -- so will a PCIe 4 drive, but the latter won't run at full speed.

Needs to be M.2 2280.

This is what I have

It depends on what  you now have in the system -- if it's an older, slower drive you may see a boost.  Most new drives are PCIe 4, which your system does not support at full speed, but you likely can max out the PCIe 3 interface the system does have.

Thank you for the quick reply.
Will I notice much difference on my laptop processing speed? I still use the factory SSD

That's a reasonably fast OEM drive -- I don't think you'll see anything major in performance difference between it and another PCIe 3x4 drive.

What is the writing speed of this one and how faster can it get with an updated one?

There's a benchmark for that drive here

https://www.harddrivebenchmark.net/hdd.php?hdd=Samsung%20PM981%20512GB%20NVMe&id=15163

As I have posted a couple of times, you may find a slightly faster drive but there won't be a major difference with anything you can use in that system -- the real jump comes at PCIe 4, for which you'll need a new notebook system -- yours cannot be retrofitted to run a drive at PCIe 4 speed.

There really isn't much you can do hardware-wise -- adding RAM is not going to speed things up much, if at all.

If you have never replaced the thermal pads that anchor the heatsinks to the CPU and GPU, that is the first thing to do.  It will allow the system to run cooler and quiet the fans.

If you're seeking a major performance boost, it's time for a new system.

Thank you for your patiente. You helped me! Kudos
What is the best thing I can do to improve my laptop speed? 2 Dimms of 32GB amountin to 64GB?
New fans? These seem to make a lot of noise already and I´ve cleaned them but temperature always high.
What else?

Can you direct me to where I buy those?

where do I buy thermal pads that anchor the heatsinks to the CPU and GPU