I have gone through periods where I've ridden more by myself than with others. I've done long stretches of group rides, centuries and tours by myself. I actually find it kind of nice to do supported rides alone, certainly nicer than trying to keep somebody else's pace.
I do try to take some special precautions when I ride alone. Someone always knows where I'm going and what time I expect to be back. I carry a cell phone, money, and my Road ID. I tend to stick to routes I'm familar with on some level and/or I make use of the marked routes in my area that the club has used. My biggest fear, to be honest, is dogs, so I started carrying Halt as well.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher