Hi,
I have a little difficulty with the shape below (see the images), a kind of pinching due to a very closed angle and that in 4 places. After trying different approaches, I couldn't find anything satisfactory. I remember a subject on this type of problem, but I can't find it on the site and I think it was about the use of the "Fillet" tool. There, I only use the "Network" tool.
I look forward to your suggestions (patiently!), Thank you.

Note: a global 3D view, two detail views, above, below, Points view.
(gogol translation!)

- Zooen