Everybody and his uncle has put out lash serums now to strengthen lashes and make them grow. I think I'd just do a search for reviews on some of these lash serums until you find one or two that have consistently good reviews and then give it a shot. High end, drugstore, they all have them now.
I do agree with Blue that just being gentle with your lashes can be a huge help. Using oil to clean off your makeup will work since you don't have to scrub and tug to remove mascara and eyeliner, and it helps to condition your lashes. Some other oils to consider, jojoba, olive, even plain baby oil are better than harsh cleansers or cleansers that just aren't good at removing eye makeup.