The two of you hit the membership problem right on the head!
When people don't see our cars at their area/local general old car shows (hot rod/custom and single make events hosted by dealers selling the promoted make of car are naturally exempted) spectators (an otherwise untapped pool of potential new car owners/members) feel that Because there are no K-F or Willys vehicles present their owners are afraid to take them anywhere and probably need any replacement parts hand-made so they are two expensive and if somebody got one there is no place they can go to for parts leads, help, etc. Barbara took our 1952 HJ Corsair deLuxe to shows in our area (we got the car in June 2017) and each year (except 2020 when there were no shows) we were able to get 1 or 2 new members. If we had 200 members who would go to their local shows with their K-F or Willys products they might have the same results. I would guess that most, if not all of these new members otherwise would have not joined the club for the reasons I have outlined here.
When you take your car (or one of your cars) to a local general old car event, you need to stay with your car rather than disappear until the show ends. There will be people who stop, look, look again and want to ask you questions about your car. This is the opening that can be used to promote the lower-cost of owning the car and availability of parts sources by showing them copies of Monthly Bulletins. You can promote the club and give the curious an honest evaluation of KFOCI membership. Since Spring 2018, I've written articles for the Quarterly about making an inexpensive way to show off your car, where to get information on your car(s) and so on.
Let's get out of the death spiral and build the orgainzation back up to the 2,000+ membership we had in the late 1970's and 1980's. We need to stop the slide in membership; since 2010, the club had a net LOSS of ov er 400 members or close to 50% of our current member level (regular members and associate members).