I understand that the form "sollten" sounds kinder/softer than "sollen" in a formal scenario. For example:
Sie sollten dieses Buch lesen.
However, does it make sense in questions, especially when I am refering to myself?
My question was triggered in a formal e-mail where I was asking about what I should do (advice). What would be better? Can they just be interchanged?
Was sollte ich machen?
Was soll ich machen?