No, there is NO such thing as cusp. You only have one Sun sign, so you are either one or another. I think you might still have Sun in Libra, and your sun sign is your star sign.
To know where your Sun sign is, you have to see your birth chart, but you need to know your birth time to get an accurate birth chart. The reasons why people who share the same star sign can be different are because they were born under different dwads and decanates, another reason is because they have a different birth chart. So, if you feel like you exhibit the characteristics of previous sign, it might be because you have Mercury, Venus, Ascendant, Moon, or several other planets in that sign.
Aspects and placements in a birth chart can influence personalities too. We are more than our Sun sign, so this is why everyone who was born under the same star sign is always different from each other.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.