Life after immersion...

Hello everyone! :) About a month and a half ago, I returned home from two months of being immersed in Russian at Middlebury College. I made huge amounts of progress while I was there. I went from knowing a few words and being able to put together pretty simple sentences to having full conversations and writing compositions. The problem is that I didn't think about what would happen after the program. I don't have much of a reason to use Russian now that I'm not under a pledge to only speak Russian all the time. I make sure to keep myself exposed to the language (music, TV, Russian friends, etc.) but this casual exposure doesn't seem to be enough and I've already forgotten so much.

What are your suggestions for getting myself back into the language? Since it's only been a short period of time, I'm sure most things will come back to me when I pick up my studies again. I'm just not really sure where to start and I suppose I'm a little afraid that I won't make any progress if I'm not completely immersed in the language. Should I buy a Russian textbook? Make more Russian friends online? Watch more Russian movies? Where do I go from here?

I was also wondering if any of you have suggestions for somewhat easy books in Russian. I have about an intermediate-high understanding of the language. Also, what is a good website to buy Russian books?

Any suggestions or advice would be great. Thank you in advance!