Autocomplete in VScode is not working properly

for some reason I don’t have autocomplete anymore as I once had doing the 3d course, not sure what changed, I saw someone already mentioned this but I didn’t understand his solution. please help

some code such as awake() can still be auto complete, but some, like Vector2, or touhscreen can’t.
the icons telling me if the code is a function a variable or something else is gone.