Q1- there is duality, some would argue otherwise but spirit and body do exist imo. The point is to have the body fulfill the spirit. Ego is just the dweller asking you to decide. When you make choices in life you stand at the threshold. This is where ego comes in. Do you fulfill the spirit or bring it down? That is your choice.
Q2- the is no absolute truth because truth lies in the eye of the beholder.
Q3- spirit does not try to make ego become more like spirit. Ego asks spirit how it wants to be fulfilled. Do you cross into negativity or do you transcend spirit to a greater level.
Q4- it does not matter what is going on in the world for that which is will be, however you can lend a stronger more positive light to the world, helping to make better outcomes.
Q5- the ego does not want to discover more, the spirit wants to grow in it's existence.
Q6- IMO the spirit is the one who wants to discover and grow. Thus creating a purpose for you. This purpose may be very simple, but ego sometimes doesn't want to allow for simple.
My best advice is to feed your spirit in the most positive way and things will look brighter.
Many may disagree with me but that is ok. This is just my thoughts, please consider any argument.