I wonder what I have done wrong and hope they will contact me and let me know.
It happens, loosing a follower may be a result of them loosing their account because they did something stupid. One time I noticed that I had last 5 followers, two of them had their accounts terminated, two more of them just thought I wasn't a reliable source, and one of them was a Die Hard Twilight Fan... You just have to move on, and keep up with the followers you do have.
One thing you have to remember-- people DO leave HubPages. Sometimes they withdraw their account and work to post on another site.
Sometimes people get banned for being naughty and not following the rules. Sometimes they just decide to change their mind about because they like to actually "follow" each post and they find it overwhelming.
I guess it could also be because they disagree with your views or are not as interested in the subjects you write about as they thought-- probably at least 100 reasons.
Don't take it personally, it probably is not about you or your writing.... and if it is it's no big deal.
Concentrate on doing your best. The followers will come-- even though it's not really that important.
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.