One thing I notice is that it's in a pot too large. North facing window is not enough light. This one looks to be rotting too. So sorry.

Generally speaking......Succulents basically need a fast draining potting mix, appropriate size pot with a hole in the bottom, bright light and some full sun, water thoroughly but infrequently. Study up on these needs and then get 1 or 2 more succulents to practice what you've learned.

I live in an apartment where the windows only face north. Is there anything else I can do?

Regular houseplants might work better in the north-facing location, something like pothos is easy and you might enjoy it.

But if you are determined to have succulents, there are a few which survive in lower light conditions. The most popular and well-known such plant is sanseveria (or snake plant). Some others which come to mind are haworthias (seen at Home Depot often), the holiday or Christmas cactus which are often sold blooming, and kalenchoe blossfeldiana (you see these for sale blooming in the supermarkets sometimes).

If you do get another succulent, please repot it with proper potting mix. (Commercial cactus and succulent mix combined 50/50 with perlite or pumice, available at Home Depot or your nursery.) Depending on the roots, pot in the same size or slightly bigger. They are generally sold in a peat mix which keeps them wet long enough to be sold but isn't good long-term at all. Gently remove all the peat mix before repotting in proper mix.

That pot in your pic is a nice size but won't work for a small plant.

You can grow numerous Gasteria and Haworthia if you have GOOD northern light. They are not "high light" plants. Everything Socks wrote above about the size of the pot being appropriate and about the mix being 50/50 (succulent soil combined with perlite or pumice) is critical. And Socks is right about Sansevieria. They will survive just about anywhere and can even grow in decent northern light. I have probably 15 different types of Gasteria and love them. There's lots of variation and they're tough to kill.

Thank you all!