Vomit - you are right. Life is an illusion. It is life’s purpose to enjoy itself through the illusion that is us. It is like seeing through all the tricks a magician entertains with.
The fun is lost. Strip away all illusion and you are left with reality - but reality ultimately needs to take a day off. This world could be realities day off - or it could just be reality enjoying itself. Why assume that reality wants to be serious of have a purpose?