Can’t seem to find DSO’s…

I was able to find the Orion nebula and the pleiades, but apart from those I haven’t been able to find any other object. Even with the andromeda galaxy I was only able to see it once, even though you’re supposed to see it with the naked eye. I have a 6 inch dobson with which I have a x30, x80 and x150 magnification and I often watch from a bortle 5 area. I get that they’re supposed to look like small smudges, but I just can’t find them. I tried the pinwheel galaxy and the north america nebula. Any tips?