You could always try asking in /shout if anybody wants to join you for a roulette or some such. You might meet a friend that way, especially if you do it often.

Don't be afraid to start a conversation, either. Put yourself out there. Take the initiative to find a FC, a LS and a fellowship. Priortise those that align with your interests and are chatty. You might not meet success immediately but don't let it rub you the wrong way if things go awry. You can try again until you find something that fits just right.