I want an alternative visio please

Maybe LibreOffice Draw will work for you.

You can also look here for possible alternatives: https://alternativeto.net/software/microsoft-visio/

You can start your quest for alternatives here: https://alternativeto.net/software/microsoft-visio/?platform=mac

I’fe used (older) versions of OmniGraffle for tasks Visio is also used for, and it’s worked well.

At work the Mac users use Draw.io which can import and export Visio files.