Can't get rid of artefacts after beveling

I’ve managed to get rid of most of the artefacts (small black gaps around the bevel area) by sliding or merging verts. But there are a few remaining that don’t seem to be affected by moving or merging vertices at all. Can someone help please?

hello, it’s hard to understand what’s happening, maybe share your object, or at least this part

https://pasteall.org/blend/