As I posted recently on a different thread, and as others have suggested, offload some of the files on your internal SSD to an external one. My M1 Studio has a 1TB drive (and 32 GB of memory, though that isn't the point here), and if I loaded all the photographs I take onto it, it would soon be full – so I write all my photograph files initially to an external SSD, and only write a selection of these image files to the internal storage. I have a number of Samsung T7 2TB drives, though of course other brands are available, as they say. Although the read/write speeds of my internal drive are much faster than the external drives, in practice when I access image files from the external storage I see no difference in the time it takes to load them, so don't obsess about read/write speeds on external storage – so long as they are SSDs. And absolutely have backup copies. I use a 4TB T7 for Time Machine, which backs up what is on the internal storage plus an attached 2TB T7 containing the image files initially downloaded from the camera card, and I regularly copy all important files to another T7 which my daughter holds on to.
And because I'm paranoid, if I'm out of the house for any time I take my Time Machine drive with me, so if I were to return to find my computer gone, I'd still have all my files.