<human>: I've been getting credit card solicitations ever since I started college three years ago, but while I knew I'd have to build some credit before graduating, I kept throwing away the mailers until a couple of months ago.  After doing a little research, I decided to get a Discover It card around the beginning of May.  Since I'd previously only had my three years of Perkins and Stafford loans and a Les Schwab credit account I opened back in October when I bought a new set of tires, I hadn't checked my FICO score before; to my surprise, the packet that came with my card said that I had a 704, and they gave me a $2500 credit limit.  I'm being good with a card--I'm keeping the balance below 30% of my limit, paying well above the monthly minimum, making those payments right after I get my statements, and not using the card for anything I couldn't just use my debit card for (there's no real penalty since I have 0% APR for a while, and I'm getting cashback rewards).

I've been told that the 704 score and $2500 limit are pretty good for my age and credit history, but since I'll need to find an apartment to rent and hopefully buy a new car after I graduate next year, I'd like to make my credit situation as favorable as possible.  So are there any particular things I should do to that end?  I'm planning on making some payments toward my student loans soon to reduce the total before I graduate, but should I look into getting another credit card or two after a few months?

Could you distill the essence of the text into 1-3 sentences?
<bot>: I'm a 21-year-old with one credit card and it sounds like I'm in a decent credit position for my age.  Where can I go from here to have the best possible credit after I graduate in eleven months?