I fully agree. It's all about meeting enough potential partners with similar interests. Shared-activities with healthy gender balance (at least for heterosexual relationships) are the best bet for most people. Many such activities also don't require long-term commitment or hanging out with same people all the time, so rejection isn't as awkward as in workplace for example.
Of all things I tried shared activities worked the best, Tinder the worst.
Yeah, gender balance is often skewed. While I'm not on the market I've noticed this with the hiking community--overall, it appears approximately balanced but most actual hikes are not. The long hikes are highly male-dominated, the short ones are rather female-dominated. I've met some women that joined specifically to look for dates--and I've never seen any of them in a group that wasn't female dominant.
Coed team sports are a great way to avoid this, since there’s necessarily a rough gender balance. Join your local ultimate frisbee summer league or whatever.
Of all things I tried shared activities worked the best, Tinder the worst.