Evolution and progress means you should not look back and regret for liquidating / dropping a name. You dropped it for a reason and it's not possible your view as a domainer back then to be better than your view now. If the name was good, you wouldn't drop and renew it. Even if you didn't have money, you would find it somehow to renew a really good name.
I have dropped and liquidated hundreds of names, because they were not good names. Period.
By the way, I never never look at my old portfolios, always look in the present and the future.