VisualCode Shortcut to display autocomplete list before typing in MacOS

I solved this problem using fn+control+space.
Hope it helps you.

In case you are a CJK user using Mac, Ctrl + Space will not work, since it is used to switch IMEs. There is another keyboard shortcut for triggering suggestions: Option + Esc or Alt + Esc if you are using a Windows keyboard.

Also see post here.