Honestly, I don't know what to say. To me, when one book ends, another typically begins with a short painful period of inactivity between then. I don't do much beyond writing books. Unfortunately, I don't have much time or money to spend on conventions. I rarely go out. In fact, most of my social life takes place on the net.
Stacia said everything I pretty much had to say on this subject. So my post will be very short: if you want to succeed as a writer, take time to have fun.
Take pleasure in your friends' successes. Even if they write better than you, sell more than you, or reviewed better than you. Everyone gets a bite of a little professional jealousy now and then, and that's fine. We're all human. But don't let jealousy consume you. It's not healthy.
Take time to smell the roses outside. It a big huge world and writing isn't the only thing in it. Go out. Have fun. Walk on the beach. Have coffee with friends. Volunteer. So many of us define ourselves by what we do that we forget that there is more to our identity.
Take time to help friends who need it. I can't tell you how much it means to me to be able to cry on my friends' shoulders or share gossip, or just be plain stupid together. It makes all the difference in the world.
I think that if you take time to be a better person, it will in the long run pay off in many ways. And I think that in small part, it will help with your writing. Your work will be fuller and richer. People will read your blog because you will be interesting, and you will make those connections Anton mentioned. And you'll have good karma.
Can;t beat good karma.