Upgrading M.2 Intel Optane SSD on Inspiron 5680 Gaming PC

Hey guys. Looking to upgrade the SSD drive that's in my Dell Inspiron 5680 gaming computer. For some reason, my drive space is getting eaten alive and I don't know what is doing it. This is my main gaming rig and lately this issue has been eating me alive. The lowest amount left that I've seen is somewhere between 2-4 GB left. Thankfully it is not affecting the usability of the computer, but I have been getting very cautious about this every time I use it for video editing or gaming on it to the point where I keep my eyes on the drive space almost 100% of the time. I have a separate 3 TB HDD installed where all my data and application and game installs are always placed in. To remedy this issue, I've been creating new users and deleting the previous old user accounts including the user folder to get my space back. At that point, I will have just about 18-20 GB of space left. But every time I use it in any way, shape or form, it will slowly go right back to having 4-5 GB of space left over. Today's new user creation result may be the final straw here. I now only have 12 GB of space left with the new user creation. The previous user folder deleted itself automatically this time around. Signing out and signing back in, restarting computer did not help. And so thus, I will be going up from 128 GB to 256 GB. Any issues I may run into here? Or will it be ok just like a regular hard drive? Plus, any tips on how I can xfer the OS between drives? I'm running Windows 11 x64 on it.