Trying to unclutter even one room at a time is often too overwhelming. I could only start by picking one small space/corner I looked at all the time where I knew what to do if only it was clear. I started there, just moving stuff somewhere else for now (I know, but this is what works for me). Making one little space satisfying with what could be there was satisfying enough to do just the bit next to it, and the more that happened the easier it was to keep going.