Let users help FD find more users (like Patreon)
FireDating's biggest challenge is its very small userbase. Existing users significantly benefit when FD grows. So, let users reimburse FD for a paid ad campaign advertising FD to the user's desired geographic area, age range, and gender.x
New users will benefit both the site as a whole and probably the user who funded the ad campaign. It's a bit like Kickstarter or Patreon for helping FireDating grow. Much like a Kickstarter backer or Patreon supporter, the FD user reimbursing FD for the ad campaign is taking the risk that it'll work out -- that of the new users near them who sign up, some will match with them.
Why is this important? Users are here for conversations and relationships, but the current userbase is so small that the number of matches is inherently very limited. You could implement every other item on the feature board and it would not make a big difference in how many people establish relationships through the site. The thing that *could* make the site meaningfully more useful, is more users.
Per https://firedating.me/open/ , the most active areas are Seattle and NYC, each of which have about 310 profiles across all genders and age ranges. A specific user might find 40 or 50 profiles within a 10-year age range and their desired gender. Of those, only 13% have been active in the last 90 days. Finally, per that page, the conversation acceptance rate is 29%.
In our example of 50 matching profiles, on average 0.13*50 = 6-7 of them will have been active in the last 3 months, and 0.29*7 = 2 of those will respond. And that's completely ignoring the aspects of someone's profile -- hopefully people are not contacting all matching users!
Also, if you asked users and prospective users to pick the thing that's important to them, more matches (and potentially relationships) or any feature on the feature board, the vast majority would prefer more matches.
Letting users fund ad campaigns for FireDating also addresses another problem, which is that "critical mass" in one area is far more useful than simply increasing the user count by, say, 25% everywhere. Growing 25% globally would not make a big impact. However, going from ~310 profiles in NYC to, say, 1000 profiles would make a tremendous impact - particularly if the growth was within a certain age range and the new users helped the site achieve roughly 50/50 balance between desired genders.
Because the FIRE community is fairly small and quite target-able (like by targeting ads to FIRE-related subreddits), it's quite possible that a single user could fund an ad campaign to triple or quadruple the number of users in a given city. That would fundamentally change the usefulness of FD in that city. One would need to measure the conversion funnel to know for sure, but it's possible. Also, this paid growth is likely to translate to faster organic growth too: the site will be more useful to new users than it was to past users, especially since they're all joining at once (all active) and all in the same area.
The question is how to get more users without changing the nature of the site. With a non-commercial public service like FireDating, letting users reimburse FireDating for geo+age+gender-specific ad campaigns seems like a great way to do that.