You can have a great time alone. If you have some good music, internet access, and are in an environment that you feel safe, you should be good to go.
Posting on bluelight is enjoyable because you can really appreciate what a great community of people are here to help each other out. Just laying back and enjoying the music is also very nice. I like to have a pen and paper during certain highs to take notes down when I get a thought that I want to make sure to remember, because they are often difficult to bring back once the effects wear off.
My last roll was half alone, and the second half I met up with somebody that is close to me to talk. If there is anybody you know who is accepting of your MDMA use, a phone call might bring you a great conversation.