Yeah, online is the only option if you want someone who is also orthodox. I got to a thriving (and I mean THRIVING) parish. We have a good number of young adults (many who Ive gotten to know and who over time Ive become friends with). That said, Almost all of them are married, male, or FAR outside an acceptable age difference. There just isn't the opportunity to meet people in person unless you go to conferences. Even then its hard to keep in touch with them afterwords simply because of the distance. It takes enormous effort on both peoples parts, more effort than its probably healthy to put forward with someone you've met in person once.
This is just my experience, but being more active isn't going to help much. I have a full life, I spend time out with people multiple times a week, I'm trying new hobbies, I am involved at my parish, I'm not someone just sitting at home. But none of that is bringing me one single inch closer to meeting a future spouse, simply because I'm only looking for someone who shares my faith(orthodoxy). They may be great people, and Ive made friends, very good friends, but when it comes to seeking a spouse it simply isn't enough if your looking for someone orthodox.
I'll be honest, there isn't a solution to the problem. Online dating in general is a cesspool and the low numbers on orthodox sites make it even worse sometimes. Lack of opportunity to meet anyone at all is a problem, and just because an person is orthodox doesn't me we are a match, it just means we might be. Ive more or less given up all hope. I'll keep putting myself out there, but actually meeting someone would impress me more than the literal raising of the dead.