Another try at AdSense?

I have been thinking about applying for a new AdSense account. A few months ago I lost my AdSense account because Google told me that I had been having invalid clicks on my AdSense ads. Instead of giving up on AdSense, I am now thinking - why not give it another try? I earned about $100 before my account was deactivated. I lost the money, but it seems that I could be making a lot of money with AdSense. The problem is that I don´t know why the deactivated my account, and I am not sure if it´s possible to get a new account with AdSense or if I am banned for life... they never explained this to me. Well, I can always apply for a new account. The worst they can do is to tell me that I am not approved for the account.